remove impl

runtime/math_functions.cpp

@@ -267,35 +267,6 @@ Optional<string> f$random_bytes(int64_t length) noexcept {
   return str;
 }
 
-mixed f$abs(const mixed &v) {
-  mixed num = v.to_numeric();
-  if (num.is_int()) {
-    return std::abs(num.to_int());
-  }
-  return fabs(num.to_float());
-}
-
-int64_t f$abs(int64_t v) {
-  return std::abs(v);
-}
-
-double f$abs(double v) {
-  return std::abs(v);
-}
-
-int64_t f$abs(const Optional<int64_t> &v) {
-  return f$abs(val(v));
-}
-
-int64_t f$abs(const Optional<bool> &v) {
-  return f$abs(static_cast<int64_t>(val(v)));
-}
-
-double f$abs(const Optional<double> &v) {
-  return f$abs(val(v));
-}
-
-
 
 string f$base_convert(const string &number, int64_t frombase, int64_t tobase) {
   if (frombase < 2 || frombase > 36) {