Fix %g in fmt, and make %v default to %g for floats

core/strconv/generic_float.odin

@@ -2,6 +2,8 @@ package strconv
 
 import "decimal"
 
+import "core:runtime"
+
 Decimal_Slice :: struct {
 	digits:        []byte,
 	count:         int,
@@ -103,8 +105,11 @@ generic_ftoa :: proc(buf: []byte, val: f64, fmt: byte, precision, bit_size: int)
 		}
 	} else {
 		switch fmt {
-		case 'e', 'E': decimal.round(d, prec+1)
-		case 'f', 'F': decimal.round(d, d.decimal_point+prec)
+		case 'e', 'E':
+			prec += 1
+			decimal.round(d, prec)
+		case 'f', 'F':
+			decimal.round(d, d.decimal_point+prec)
 		case 'g', 'G':
 			if prec == 0 {
 				prec = 1