function baseIsNative(value) {
  if (!isObject(value) || isMasked(value)) {
    return false;
  }
  var pattern = isFunction(value) ? reIsNative : reIsHostCtor;
  return pattern.test(toSource(value));
}
The base implementation of `_.isNative` without bad shim checks.

@private
@param {*} value The value to check.
@returns {boolean} Returns `true` if `value` is a native function,
 else `false`.