Function patch_seq_base64url_decode 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn patch_seq_base64url_decode(
    stack: Stack,
) -> Stack

Decode a URL-safe Base64 string (no padding expected)

Stack effect: ( String – String Bool )

Returns the decoded string and true on success, empty string and false on failure.

Safety

Stack must have a String value on top