diff --git a/core/math/big/common.odin b/core/math/big/common.odin
index 562aa46fa..56b8a1083 100644
--- a/core/math/big/common.odin
+++ b/core/math/big/common.odin
@@ -111,7 +111,7 @@ Flags :: bit_set[Flag; u8];
 Error :: enum int {
 	Okay                    = 0,
 	Out_Of_Memory           = 1,
-	Invalid_Pointer         = 2,
+	// Invalid_Pointer         = 2,
 	Invalid_Argument        = 3,
 
 	Assignment_To_Immutable = 4,
@@ -127,7 +127,7 @@ Error :: enum int {
 
 Error_String :: #partial [Error]string{
 	.Out_Of_Memory           = "Out of memory",
-	.Invalid_Pointer         = "Invalid pointer",
+	// .Invalid_Pointer         = "Invalid pointer",
 	.Invalid_Argument        = "Invalid argument",
 
 	.Assignment_To_Immutable = "Assignment to immutable",
diff --git a/core/math/big/helpers.odin b/core/math/big/helpers.odin
index 3b28b1833..dd8f70f4b 100644
--- a/core/math/big/helpers.odin
+++ b/core/math/big/helpers.odin
@@ -41,7 +41,7 @@ int_set_from_integer :: proc(dest: ^Int, src: $T, minimize := false, allocator :
 		Check that `src` is usable and `dest` isn't immutable.
 	*/
 	assert_if_nil(dest);
-	if err = #force_inline internal_error_if_immutable(dest);    err != nil { return err; }
+	if err = #force_inline internal_error_if_immutable(dest); err != nil { return err; }
 
 	return #force_inline internal_int_set_from_integer(dest, src, minimize, allocator);
 }
@@ -61,8 +61,8 @@ int_copy :: proc(dest, src: ^Int, minimize := false, allocator := context.alloca
 		Check that `src` is usable and `dest` isn't immutable.
 	*/
 	assert_if_nil(dest, src);
-	if err = #force_inline internal_clear_if_uninitialized(src); err != nil { return err; }
-	if err = #force_inline internal_error_if_immutable(dest);    err != nil { return err; }
+	if err = #force_inline internal_clear_if_uninitialized(src, allocator); err != nil { return err; }
+	if err = #force_inline internal_error_if_immutable(dest);               err != nil { return err; }
 
 	return #force_inline internal_int_copy(dest, src, minimize, allocator);
 }
@@ -87,8 +87,8 @@ int_abs :: proc(dest, src: ^Int, allocator := context.allocator) -> (err: Error)
 		Check that `src` is usable and `dest` isn't immutable.
 	*/
 	assert_if_nil(dest, src);
-	if err = #force_inline internal_clear_if_uninitialized(src); err != nil { return err; }
-	if err = #force_inline internal_error_if_immutable(dest);    err != nil { return err; }
+	if err = #force_inline internal_clear_if_uninitialized(src, allocator); err != nil { return err; }
+	if err = #force_inline internal_error_if_immutable(dest);               err != nil { return err; }
 
 	return #force_inline internal_int_abs(dest, src, allocator);
 }
@@ -106,8 +106,8 @@ int_neg :: proc(dest, src: ^Int, allocator := context.allocator) -> (err: Error)
 		Check that `src` is usable and `dest` isn't immutable.
 	*/
 	assert_if_nil(dest, src);
-	if err = #force_inline internal_clear_if_uninitialized(src); err != nil { return err; }
-	if err = #force_inline internal_error_if_immutable(dest);    err != nil { return err; }
+	if err = #force_inline internal_clear_if_uninitialized(src, allocator); err != nil { return err; }
+	if err = #force_inline internal_error_if_immutable(dest);               err != nil { return err; }
 
 	return #force_inline internal_int_neg(dest, src, allocator);
 }
@@ -116,16 +116,16 @@ neg :: proc { int_neg, };
 /*
 	Helpers to extract values from the `Int`.
 */
-int_bitfield_extract_single :: proc(a: ^Int, offset: int) -> (bit: _WORD, err: Error) {
-	return #force_inline int_bitfield_extract(a, offset, 1);
+int_bitfield_extract_single :: proc(a: ^Int, offset: int, allocator := context.allocator) -> (bit: _WORD, err: Error) {
+	return #force_inline int_bitfield_extract(a, offset, 1, allocator);
 }
 
-int_bitfield_extract :: proc(a: ^Int, offset, count: int) -> (res: _WORD, err: Error) {
+int_bitfield_extract :: proc(a: ^Int, offset, count: int, allocator := context.allocator) -> (res: _WORD, err: Error) {
 	/*
 		Check that `a` is usable.
 	*/
 	assert_if_nil(a);
-	if err = #force_inline internal_clear_if_uninitialized(a); err != nil { return 0, err; }
+	if err = #force_inline internal_clear_if_uninitialized(a, allocator); err != nil { return {}, err; }
 
 	return #force_inline internal_int_bitfield_extract(a, offset, count);
 }
@@ -372,28 +372,13 @@ int_random_digit :: proc(r: ^rnd.Rand = nil) -> (res: DIGIT) {
 	return 0; // We shouldn't get here.
 }
 
-int_rand :: proc(dest: ^Int, bits: int, r: ^rnd.Rand = nil) -> (err: Error) {
-	bits := bits;
+int_rand :: proc(dest: ^Int, bits: int, r: ^rnd.Rand = nil, allocator := context.allocator) -> (err: Error) {
+	/*
+		Check that `a` is usable.
+	*/
+	assert_if_nil(dest);
+	return #force_inline internal_int_rand(dest, bits, r, allocator);
 
-	if bits <= 0 { return .Invalid_Argument; }
-
-	digits := bits / _DIGIT_BITS;
-	bits   %= _DIGIT_BITS;
-
-	if bits > 0 {
-		digits += 1;
-	}
-
-	if err = grow(dest, digits); err != nil { return err; }
-
-	for i := 0; i < digits; i += 1 {
-		dest.digit[i] = int_random_digit(r) & _MASK;
-	}
-	if bits > 0 {
-		dest.digit[digits - 1] &= ((1 << uint(bits)) - 1);
-	}
-	dest.used = digits;
-	return nil;
 }
 rand :: proc { int_rand, };
 
@@ -401,31 +386,28 @@ rand :: proc { int_rand, };
 	Internal helpers.
 */
 assert_initialized :: proc(a: ^Int, loc := #caller_location) {
+	assert_if_nil(a);
 	assert(is_initialized(a), "`Int` was not properly initialized.", loc);
 }
 
 zero_unused :: proc(dest: ^Int, old_used := -1) {
-	if dest == nil { return; }
+	assert_if_nil(dest);
 	if ! #force_inline is_initialized(dest) { return; }
 
-	internal_zero_unused(dest, old_used);
+	#force_inline internal_zero_unused(dest, old_used);
 }
 
-clear_if_uninitialized_single :: proc(arg: ^Int) -> (err: Error) {
-	if !is_initialized(arg) {
-		if arg == nil { return nil; }
-		return grow(arg, _DEFAULT_DIGIT_COUNT);
-	}
-	return err;
+clear_if_uninitialized_single :: proc(arg: ^Int, allocator := context.allocator) -> (err: Error) {
+	assert_if_nil(arg);
+	return #force_inline internal_clear_if_uninitialized_single(arg, allocator);
 }
 
-clear_if_uninitialized_multi :: proc(args: ..^Int) -> (err: Error) {
-	for i in args {
-		if i == nil { continue; }
-		if !is_initialized(i) {
-			e := grow(i, _DEFAULT_DIGIT_COUNT);
-			if e != nil { err = e; }
-		}
+clear_if_uninitialized_multi :: proc(args: ..^Int, allocator := context.allocator) -> (err: Error) {
+	args := args;
+	assert_if_nil(..args);
+
+	for i in &args {
+		if err = #force_inline internal_clear_if_uninitialized_single(i, allocator); err != nil { return nil; }
 	}
 	return err;
 }
@@ -448,28 +430,33 @@ error_if_immutable :: proc {error_if_immutable_single, error_if_immutable_multi,
 	Allocates several `Int`s at once.
 */
 int_init_multi :: proc(integers: ..^Int) -> (err: Error) {
+	assert_if_nil(..integers);
+
 	integers := integers;
 	for a in &integers {
-		if err = clear(a); err != nil { return err; }
+		if err = #force_inline internal_clear(a); err != nil { return err; }
 	}
 	return nil;
 }
 
 init_multi :: proc { int_init_multi, };
 
-_copy_digits :: proc(dest, src: ^Int, digits: int) -> (err: Error) {
+_copy_digits :: proc(dest, src: ^Int, digits: int, allocator := context.allocator) -> (err: Error) {
 	digits := digits;
-	if err = clear_if_uninitialized(src);  err != nil { return err; }
-	if err = clear_if_uninitialized(dest); err != nil { return err; }
+	/*
+		Check that `src` is usable and `dest` isn't immutable.
+	*/
+	assert_if_nil(dest, src);
+	if err = #force_inline internal_clear_if_uninitialized(src, allocator); err != nil { return err; }
+	if err = #force_inline internal_error_if_immutable(dest);    err != nil { return err; }
+
 	/*
 		If dest == src, do nothing
 	*/
-	if (dest == src) {
-		return nil;
-	}
+	if (dest == src) { return nil; }
 
 	digits = min(digits, len(src.digit), len(dest.digit));
-	mem.copy_non_overlapping(&dest.digit[0], &src.digit[0], size_of(DIGIT) * digits);
+	#force_inline mem.copy_non_overlapping(&dest.digit[0], &src.digit[0], size_of(DIGIT) * digits);
 	return nil;
 }
 
@@ -479,10 +466,10 @@ _copy_digits :: proc(dest, src: ^Int, digits: int) -> (err: Error) {
 	This is used to ensure that leading zero digits are trimmed and the leading "used" digit will be non-zero.
 	Typically very fast.  Also fixes the sign if there are no more leading digits.
 */
-clamp :: proc(a: ^Int) -> (err: Error) {
-	if err = clear_if_uninitialized(a); err != nil {
-		return err;
-	}
+clamp :: proc(a: ^Int, allocator := context.allocator) -> (err: Error) {
+	assert_if_nil(a);
+	if err = #force_inline internal_clear_if_uninitialized(a, allocator); err != nil { return err; }
+
 	for a.used > 0 && a.digit[a.used - 1] == 0 {
 		a.used -= 1;
 	}
@@ -493,7 +480,6 @@ clamp :: proc(a: ^Int) -> (err: Error) {
 	return nil;
 }
 
-
 /*
 	Initialize constants.
 */
@@ -528,9 +514,6 @@ assert_if_nil :: #force_inline proc(integers: ..^Int, loc := #caller_location) {
 	integers := integers;
 
 	for i in &integers {
-		if i == nil {
-			msg := fmt.tprintf("%v(nil)", loc.procedure);
-			assert(false, msg, loc);
-		}
+		assert(i != nil, "(nil)", loc);
 	}
 }
diff --git a/core/math/big/internal.odin b/core/math/big/internal.odin
index f92c41f2b..9498e473c 100644
--- a/core/math/big/internal.odin
+++ b/core/math/big/internal.odin
@@ -1850,10 +1850,6 @@ internal_int_bitfield_extract :: proc(a: ^Int, offset, count: int) -> (res: _WOR
 	Assumes `a` not to be `nil`, and to have already been initialized.
 */
 internal_int_shrink :: proc(a: ^Int) -> (err: Error) {
-	if a == nil {
-		return .Invalid_Pointer;
-	}
-
 	needed := max(_MIN_DIGIT_COUNT, a.used);
 
 	if a.used != needed {
@@ -1864,9 +1860,6 @@ internal_int_shrink :: proc(a: ^Int) -> (err: Error) {
 internal_shrink :: proc { internal_int_shrink, };
 
 internal_int_grow :: proc(a: ^Int, digits: int, allow_shrink := false, allocator := context.allocator) -> (err: Error) {
-	if a == nil {
-		return .Invalid_Pointer;
-	}
 	raw := transmute(mem.Raw_Dynamic_Array)a.digit;
 
 	/*
@@ -1899,12 +1892,9 @@ internal_grow :: proc { internal_int_grow, };
 
 /*
 	Clear `Int` and resize it to the default size.
+	Assumes `a` not to be `nil`.
 */
 internal_int_clear :: proc(a: ^Int, minimize := false, allocator := context.allocator) -> (err: Error) {
-	if a == nil {
-		return .Invalid_Pointer;
-	}
-
 	raw := transmute(mem.Raw_Dynamic_Array)a.digit;
 	if raw.cap != 0 {
 		mem.zero_slice(a.digit[:a.used]);
@@ -1912,7 +1902,7 @@ internal_int_clear :: proc(a: ^Int, minimize := false, allocator := context.allo
 	a.sign = .Zero_or_Positive;
 	a.used = 0;
 
-	return grow(a, a.used, minimize, allocator);
+	return #force_inline internal_grow(a, a.used, minimize, allocator);
 }
 internal_clear :: proc { internal_int_clear, };
 internal_zero  :: internal_clear;
@@ -1967,9 +1957,7 @@ internal_int_power_of_two :: proc(a: ^Int, power: int, allocator := context.allo
 	/*
 		Check that `a` is usable.
 	*/
-	if a == nil {
-		return .Invalid_Pointer;
-	}
+	assert_if_nil(a);
 
 	if power < 0 || power > _MAX_BIT_COUNT {
 		return .Invalid_Argument;
@@ -2142,7 +2130,7 @@ internal_int_random_digit :: proc(r: ^rnd.Rand = nil) -> (res: DIGIT) {
 	return 0; // We shouldn't get here.
 }
 
-internal_int_rand :: proc(dest: ^Int, bits: int, r: ^rnd.Rand = nil) -> (err: Error) {
+internal_int_rand :: proc(dest: ^Int, bits: int, r: ^rnd.Rand = nil, allocator := context.allocator) -> (err: Error) {
 	bits := bits;
 
 	if bits <= 0 { return .Invalid_Argument; }
@@ -2154,7 +2142,7 @@ internal_int_rand :: proc(dest: ^Int, bits: int, r: ^rnd.Rand = nil) -> (err: Er
 		digits += 1;
 	}
 
-	if err = grow(dest, digits); err != nil { return err; }
+	if err = grow(dest, digits, true, allocator); err != nil { return err; }
 
 	for i := 0; i < digits; i += 1 {
 		dest.digit[i] = int_random_digit(r) & _MASK;
@@ -2176,17 +2164,15 @@ internal_assert_initialized :: proc(a: ^Int, loc := #caller_location) {
 
 internal_clear_if_uninitialized_single :: proc(arg: ^Int, allocator := context.allocator) -> (err: Error) {
 	if !internal_is_initialized(arg) {
-		if arg == nil { return nil; }
-		return internal_grow(arg, _DEFAULT_DIGIT_COUNT, true, allocator);
+		return #force_inline internal_grow(arg, _DEFAULT_DIGIT_COUNT, true, allocator);
 	}
 	return err;
 }
 
 internal_clear_if_uninitialized_multi :: proc(args: ..^Int, allocator := context.allocator) -> (err: Error) {
 	for i in args {
-		if i == nil { continue; }
 		if !internal_is_initialized(i) {
-			e := internal_grow(i, _DEFAULT_DIGIT_COUNT, true, allocator);
+			e := #force_inline internal_grow(i, _DEFAULT_DIGIT_COUNT, true, allocator);
 			if e != nil { err = e; }
 		}
 	}
diff --git a/core/math/big/logical.odin b/core/math/big/logical.odin
index bd6bcfc6e..0ab9e2f9b 100644
--- a/core/math/big/logical.odin
+++ b/core/math/big/logical.odin
@@ -24,6 +24,7 @@ import "core:mem"
 	2's complement `and`, returns `dest = a & b;`
 */
 int_and :: proc(dest, a, b: ^Int) -> (err: Error) {
+	assert_if_nil(dest, a, b);
 	if err = clear_if_uninitialized(a, b); err != nil { return err; }
 
 	used := max(a.used, b.used) + 1;
diff --git a/core/math/big/public.odin b/core/math/big/public.odin
index 2dbb8024f..fdb7bcbd5 100644
--- a/core/math/big/public.odin
+++ b/core/math/big/public.odin
@@ -21,7 +21,7 @@ package big
 	High-level addition. Handles sign.
 */
 int_add :: proc(dest, a, b: ^Int, allocator := context.allocator) -> (err: Error) {
-	if dest == nil || a == nil || b == nil { return .Invalid_Pointer; }
+	assert_if_nil(dest, a, b);
 	if err = clear_if_uninitialized(dest, a, b); err != nil { return err; }
 	/*
 		All parameters have been initialized.
@@ -36,7 +36,7 @@ int_add :: proc(dest, a, b: ^Int, allocator := context.allocator) -> (err: Error
 	dest = a + digit;
 */
 int_add_digit :: proc(dest, a: ^Int, digit: DIGIT, allocator := context.allocator) -> (err: Error) {
-	if dest == nil || a == nil { return .Invalid_Pointer; }
+	assert_if_nil(dest, a);
 	if err = clear_if_uninitialized(a); err != nil { return err; }
 	/*
 		Grow destination as required.
@@ -53,7 +53,7 @@ int_add_digit :: proc(dest, a: ^Int, digit: DIGIT, allocator := context.allocato
 	High-level subtraction, dest = number - decrease. Handles signs.
 */
 int_sub :: proc(dest, number, decrease: ^Int, allocator := context.allocator) -> (err: Error) {
-	if dest == nil || number == nil || decrease == nil { return .Invalid_Pointer; }
+	assert_if_nil(dest, number, decrease);
 	if err = clear_if_uninitialized(dest, number, decrease); err != nil { return err; }
 	/*
 		All parameters have been initialized.
@@ -68,7 +68,7 @@ int_sub :: proc(dest, number, decrease: ^Int, allocator := context.allocator) ->
 	dest = a - digit;
 */
 int_sub_digit :: proc(dest, a: ^Int, digit: DIGIT, allocator := context.allocator) -> (err: Error) {
-	if dest == nil || a == nil { return .Invalid_Pointer; }
+	assert_if_nil(dest, a);
 	if err = clear_if_uninitialized(a); err != nil { return err; }
 	/*
 		Grow destination as required.
@@ -86,7 +86,7 @@ int_sub_digit :: proc(dest, a: ^Int, digit: DIGIT, allocator := context.allocato
 	dest = src >> 1
 */
 int_halve :: proc(dest, src: ^Int) -> (err: Error) {
-	if dest == nil || src == nil { return .Invalid_Pointer; }
+	assert_if_nil(dest, src);
 	if err = clear_if_uninitialized(dest, src); err != nil { return err; }
 	/*
 		Grow destination as required.
@@ -103,7 +103,7 @@ shr1  :: halve;
 	dest = src << 1
 */
 int_double :: proc(dest, src: ^Int) -> (err: Error) {
-	if dest == nil || src == nil { return .Invalid_Pointer; }
+	assert_if_nil(dest, src);
 	if err = clear_if_uninitialized(dest, src); err != nil { return err; }
 	/*
 		Grow destination as required.
@@ -119,7 +119,7 @@ shl1   :: double;
 	Multiply by a DIGIT.
 */
 int_mul_digit :: proc(dest, src: ^Int, multiplier: DIGIT, allocator := context.allocator) -> (err: Error) {
-	if dest == nil || src == nil { return .Invalid_Pointer; }
+	assert_if_nil(dest, src);
 	if err = clear_if_uninitialized(src, dest); err != nil { return err; }
 
 	return #force_inline internal_int_mul_digit(dest, src, multiplier, allocator);
@@ -129,7 +129,7 @@ int_mul_digit :: proc(dest, src: ^Int, multiplier: DIGIT, allocator := context.a
 	High level multiplication (handles sign).
 */
 int_mul :: proc(dest, src, multiplier: ^Int, allocator := context.allocator) -> (err: Error) {
-	if dest == nil || src == nil || multiplier == nil { return .Invalid_Pointer; }
+	assert_if_nil(dest, src, multiplier);
 	if err = clear_if_uninitialized(dest, src, multiplier); err != nil { return err; }
 
 	return #force_inline internal_int_mul(dest, src, multiplier, allocator);
@@ -154,7 +154,7 @@ int_divmod :: proc(quotient, remainder, numerator, denominator: ^Int) -> (err: E
 }
 
 int_divmod_digit :: proc(quotient, numerator: ^Int, denominator: DIGIT) -> (remainder: DIGIT, err: Error) {
-	if quotient == nil { return 0, .Invalid_Pointer; };
+	assert_if_nil(quotient, numerator);
 	if err = clear_if_uninitialized(numerator); err != nil { return 0, err; }
 
 	return #force_inline internal_divmod(quotient, numerator, denominator);
@@ -162,14 +162,14 @@ int_divmod_digit :: proc(quotient, numerator: ^Int, denominator: DIGIT) -> (rema
 divmod :: proc{ int_divmod, int_divmod_digit, };
 
 int_div :: proc(quotient, numerator, denominator: ^Int) -> (err: Error) {
-	if quotient == nil { return .Invalid_Pointer; };
+	assert_if_nil(quotient, numerator, denominator);
 	if err = clear_if_uninitialized(numerator, denominator); err != nil { return err; }
 
 	return #force_inline internal_divmod(quotient, nil, numerator, denominator);
 }
 
 int_div_digit :: proc(quotient, numerator: ^Int, denominator: DIGIT) -> (err: Error) {
-	if quotient == nil { return .Invalid_Pointer; };
+	assert_if_nil(quotient, numerator);
 	if err = clear_if_uninitialized(numerator); err != nil { return err; }
 
 	remainder: DIGIT;
@@ -184,7 +184,7 @@ div :: proc { int_div, int_div_digit, };
 	denominator < remainder <= 0 if denominator < 0
 */
 int_mod :: proc(remainder, numerator, denominator: ^Int) -> (err: Error) {
-	if remainder == nil { return .Invalid_Pointer; };
+	assert_if_nil(remainder, numerator, denominator);
 	if err = clear_if_uninitialized(numerator, denominator); err != nil { return err; }
 
 	return #force_inline internal_int_mod(remainder, numerator, denominator);
@@ -200,7 +200,7 @@ mod :: proc { int_mod, int_mod_digit, };
 	remainder = (number + addend) % modulus.
 */
 int_addmod :: proc(remainder, number, addend, modulus: ^Int) -> (err: Error) {
-	if remainder == nil { return .Invalid_Pointer; };
+	assert_if_nil(remainder, number, addend);
 	if err = clear_if_uninitialized(number, addend, modulus); err != nil { return err; }
 
 	return #force_inline internal_addmod(remainder, number, addend, modulus);
@@ -211,7 +211,7 @@ addmod :: proc { int_addmod, };
 	remainder = (number - decrease) % modulus.
 */
 int_submod :: proc(remainder, number, decrease, modulus: ^Int) -> (err: Error) {
-	if remainder == nil { return .Invalid_Pointer; };
+	assert_if_nil(remainder, number, decrease);
 	if err = clear_if_uninitialized(number, decrease, modulus); err != nil { return err; }
 
 	return #force_inline internal_submod(remainder, number, decrease, modulus);
@@ -222,7 +222,7 @@ submod :: proc { int_submod, };
 	remainder = (number * multiplicand) % modulus.
 */
 int_mulmod :: proc(remainder, number, multiplicand, modulus: ^Int) -> (err: Error) {
-	if remainder == nil { return .Invalid_Pointer; };
+	assert_if_nil(remainder, number, multiplicand);
 	if err = clear_if_uninitialized(number, multiplicand, modulus); err != nil { return err; }
 
 	return #force_inline internal_mulmod(remainder, number, multiplicand, modulus);
@@ -233,7 +233,7 @@ mulmod :: proc { int_mulmod, };
 	remainder = (number * number) % modulus.
 */
 int_sqrmod :: proc(remainder, number, modulus: ^Int) -> (err: Error) {
-	if remainder == nil { return .Invalid_Pointer; };
+	assert_if_nil(remainder, number, modulus);
 	if err = clear_if_uninitialized(number, modulus); err != nil { return err; }
 
 	return #force_inline internal_sqrmod(remainder, number, modulus);
@@ -243,7 +243,7 @@ sqrmod :: proc { int_sqrmod, };
 
 int_factorial :: proc(res: ^Int, n: int) -> (err: Error) {
 	if n < 0 || n > FACTORIAL_MAX_N { return .Invalid_Argument; }
-	if res == nil { return .Invalid_Pointer; }
+	assert_if_nil(res);
 
 	return #force_inline internal_int_factorial(res, n);
 }
@@ -266,7 +266,7 @@ factorial :: proc { int_factorial, };
 
 */
 int_choose_digit :: proc(res: ^Int, n, k: int) -> (err: Error) {
-	if res == nil  { return .Invalid_Pointer; }
+	assert_if_nil(res);
 	if n < 0 || n > FACTORIAL_MAX_N { return .Invalid_Argument; }
 
 	if k > n { return zero(res); }
@@ -291,10 +291,12 @@ choose :: proc { int_choose_digit, };
 /*
 	Function computing both GCD and (if target isn't `nil`) also LCM.
 */
-int_gcd_lcm :: proc(res_gcd, res_lcm, a, b: ^Int) -> (err: Error) {
+int_gcd_lcm :: proc(res_gcd, res_lcm, a, b: ^Int, allocator := context.allocator) -> (err: Error) {
 	if res_gcd == nil && res_lcm == nil { return nil; }
-	if err = clear_if_uninitialized(res_gcd, res_lcm, a, b); err != nil { return err; }
+	assert_if_nil(a, b);
 
+	if err = clear_if_uninitialized(a, allocator); err != nil { return err; }
+	if err = clear_if_uninitialized(b, allocator); err != nil { return err; }
 	return #force_inline internal_int_gcd_lcm(res_gcd, res_lcm, a, b);
 }
 gcd_lcm :: proc { int_gcd_lcm, };
@@ -319,7 +321,8 @@ lcm :: proc { int_lcm, };
 	remainder = numerator % (1 << bits)
 */
 int_mod_bits :: proc(remainder, numerator: ^Int, bits: int) -> (err: Error) {
-	if remainder == nil || numerator == nil { return .Invalid_Pointer; }
+	assert_if_nil(remainder, numerator);
+
 	if err = clear_if_uninitialized(remainder, numerator); err != nil { return err; }
 	if bits  < 0 { return .Invalid_Argument; }
 
@@ -333,7 +336,7 @@ mod_bits :: proc { int_mod_bits, };
 	Logs and roots and such.
 */
 int_log :: proc(a: ^Int, base: DIGIT) -> (res: int, err: Error) {
-	if a == nil { return 0, .Invalid_Pointer; }
+	assert_if_nil(a);
 	if err = clear_if_uninitialized(a); err != nil { return 0, err; }
 
 	return #force_inline internal_int_log(a, base);
@@ -348,7 +351,7 @@ log :: proc { int_log, digit_log, };
 	Calculate `dest = base^power` using a square-multiply algorithm.
 */
 int_pow :: proc(dest, base: ^Int, power: int) -> (err: Error) {
-	if dest == nil || base == nil { return .Invalid_Pointer; }
+	assert_if_nil(dest, base);
 	if err = clear_if_uninitialized(dest, base); err != nil { return err; }
 
 	return #force_inline internal_int_pow(dest, base, power);
@@ -358,7 +361,7 @@ int_pow :: proc(dest, base: ^Int, power: int) -> (err: Error) {
 	Calculate `dest = base^power` using a square-multiply algorithm.
 */
 int_pow_int :: proc(dest: ^Int, base, power: int) -> (err: Error) {
-	if dest == nil { return .Invalid_Pointer; }
+	assert_if_nil(dest);
 
 	return #force_inline internal_pow(dest, base, power);
 }
@@ -374,7 +377,7 @@ small_pow :: proc(base: _WORD, exponent: _WORD) -> (result: _WORD) {
 	This function is less generic than `root_n`, simpler and faster.
 */
 int_sqrt :: proc(dest, src: ^Int) -> (err: Error) {
-	if dest == nil || src == nil { return .Invalid_Pointer; }
+	assert_if_nil(dest, src);
 	if err = clear_if_uninitialized(dest, src);	err != nil { return err; }
 
 	return #force_inline internal_int_sqrt(dest, src);
@@ -395,7 +398,7 @@ int_root_n :: proc(dest, src: ^Int, n: int) -> (err: Error) {
 	*/
 	if n == 2 { return sqrt(dest, src); }
 
-	if dest == nil || src == nil { return .Invalid_Pointer; }
+	assert_if_nil(dest, src);
 	/*
 		Initialize dest + src if needed.
 	*/
@@ -416,35 +419,35 @@ int_is_initialized :: proc(a: ^Int) -> bool {
 }
 
 int_is_zero :: proc(a: ^Int) -> (zero: bool, err: Error) {
-	if a == nil { return false, .Invalid_Pointer; }
+	assert_if_nil(a);
 	if err = clear_if_uninitialized(a); err != nil { return false, err; }
 
 	return #force_inline internal_is_zero(a), nil;
 }
 
 int_is_positive :: proc(a: ^Int) -> (positive: bool, err: Error) {
-	if a == nil { return false, .Invalid_Pointer; }
+	assert_if_nil(a);
 	if err = clear_if_uninitialized(a); err != nil { return false, err; }
 
 	return #force_inline internal_is_positive(a), nil;
 }
 
 int_is_negative :: proc(a: ^Int) -> (negative: bool, err: Error) {
-	if a == nil { return false, .Invalid_Pointer; }
+	assert_if_nil(a);
 	if err = clear_if_uninitialized(a); err != nil { return false, err; }
 
 	return #force_inline internal_is_negative(a), nil;
 }
 
 int_is_even :: proc(a: ^Int) -> (even: bool, err: Error) {
-	if a == nil { return false, .Invalid_Pointer; }
+	assert_if_nil(a);
 	if err = clear_if_uninitialized(a); err != nil { return false, err; }
 
 	return #force_inline internal_is_even(a), nil;
 }
 
 int_is_odd :: proc(a: ^Int) -> (odd: bool, err: Error) {
-	if a == nil { return false, .Invalid_Pointer; }
+	assert_if_nil(a);
 	if err = clear_if_uninitialized(a); err != nil { return false, err; }
 
 	return #force_inline internal_is_odd(a), nil;
@@ -455,7 +458,7 @@ platform_int_is_power_of_two :: #force_inline proc(a: int) -> bool {
 }
 
 int_is_power_of_two :: proc(a: ^Int) -> (res: bool, err: Error) {
-	if a == nil { return false, .Invalid_Pointer; }
+	assert_if_nil(a);
 	if err = clear_if_uninitialized(a); err != nil { return false, err; }
 
 	return #force_inline internal_is_power_of_two(a), nil;
@@ -465,7 +468,7 @@ int_is_power_of_two :: proc(a: ^Int) -> (res: bool, err: Error) {
 	Compare two `Int`s, signed.
 */
 int_compare :: proc(a, b: ^Int) -> (comparison: int, err: Error) {
-	if a == nil || b == nil { return 0, .Invalid_Pointer; }
+	assert_if_nil(a, b);
 	if err = clear_if_uninitialized(a, b); err != nil {	return 0, err; }
 
 	return #force_inline internal_cmp(a, b), nil;
@@ -476,7 +479,7 @@ int_cmp :: int_compare;
 	Compare an `Int` to an unsigned number upto the size of the backing type.
 */
 int_compare_digit :: proc(a: ^Int, b: DIGIT) -> (comparison: int, err: Error) {
-	if a == nil { return 0, .Invalid_Pointer; }
+	assert_if_nil(a);
 	if err = clear_if_uninitialized(a); err != nil { return 0, err; }
 
 	return #force_inline internal_cmp_digit(a, b), nil;
@@ -487,7 +490,7 @@ int_cmp_digit :: int_compare_digit;
 	Compare the magnitude of two `Int`s, unsigned.
 */
 int_compare_magnitude :: proc(a, b: ^Int) -> (res: int, err: Error) {
-	if a == nil || b == nil { return 0, .Invalid_Pointer; }
+	assert_if_nil(a, b);
 	if err = clear_if_uninitialized(a, b); err != nil { return 0, err; }
 
 	return #force_inline internal_cmp_mag(a, b), nil;