GObject.param_value_convert

function param_value_convert(pspec: GObject.ParamSpec, src_value: Any, dest_value: Any, strict_validation: Boolean): Boolean {
    // Gjs wrapper for g_param_value_convert()
}
  

Transforms src_value into dest_value if possible, and then validates dest_value, in order for it to conform to pspec. If strict_validation is true this function will only succeed if the transformed dest_value complied to pspec without modifications.

See also GObject.value_type_transformable, GObject.Value.transform and GObject.param_value_validate.