static enum is_number int_standalone_check_number(
    r_obj* x,
    r_obj* ffi_min,
    r_obj* ffi_max,
    r_obj* allow_na,
    r_obj* allow_null
);

static enum is_number dbl_standalone_check_number(
    r_obj* x,
    r_obj* allow_decimal,
    r_obj* ffi_min,
    r_obj* ffi_max,
    r_obj* allow_infinite,
    r_obj* allow_na,
    r_obj* allow_null
);
