add floats to string builder

core/strings/builder.odin

@@ -299,6 +299,13 @@ write_escaped_rune :: proc(b: ^Builder, r: rune, quote: byte, html_safe := false
 	return
 }
 
+// writes a f64 value into the builder, returns the written amount of characters
+write_float :: proc(b: ^Builder, f: f64, fmt: byte, prec, bit_size: int) -> (n: int) {
+	buf: [384]byte
+	s := strconv.append_float(buf[:], f, fmt, prec, bit_size)
+	return write_string(b, s)
+}
+
 // writes a u64 value `i` in `base` = 10 into the builder, returns the written amount of characters
 write_u64 :: proc(b: ^Builder, i: u64, base: int = 10) -> (n: int) {
 	buf: [32]byte