Electrum doesn't consider BIP21 URI invalid when it contains unknown required parameters

[kristapsk]

BIP21 says:

Variables which are prefixed with a req- are considered required. If a client does not implement any variables which are prefixed with req-, it MUST consider the entire URI invalid. Any other variables which are not implemented, but which are not prefixed with a req-, can be safely ignored.

Electrum seems to be ignoring that. With test URI bitcoin:TB1QXJ6KVTE6URY2MX695METFTFT7LR5HYK4M3VT5F?amount=0.00100000&label=test&req-test=1 instead of giving error to the user (note req-test=1 parameter), it is parsed successfully.

In comparsion - Bitcoin Core GUI, Wasabi Wallet, JoinMarket and others will give error.

Current BIP77 Payjoin v2 draft specifies new parameter req-pj where receiver signals that he is ok receiving only payjoins, not simple sends. Electrum would silently ignore that.

[SomberNight]

ACK.