NSS can't PATCH booleans represented as "true" or "false"

Issue can be seen in action here (view the Network requests in your browser's DevTools): https://codesandbox.io/s/inruptsolid-client-js-sandbox-forked-xyvbg?file=/src/index.ts

GET https://vincent-test.inrupt.net/public/booleantest.ttl:

@prefix : <#>.
@prefix n0: <http://example.com/>.

:me n0:testbool true.

Alright, now let's try to turn that true to false:

PATCH to https://vincent-test.inrupt.net/public/booleantest.ttl with request body:

DELETE DATA {<https://vincent-test.inrupt.net/public/booleantest.ttl#me> <http://example.com/testbool> "true"^^<http://www.w3.org/2001/XMLSchema#boolean>.}; INSERT DATA {<https://vincent-test.inrupt.net/public/booleantest.ttl#me> <http://example.com/testbool> "false"^^<http://www.w3.org/2001/XMLSchema#boolean>.};

Response: 409 Conflict:

The patch could not be applied. Could not find to delete: <https://vincent-test.inrupt.net/public/booleantest.ttl#me> <http://example.com/testbool> "true"^^<http://www.w3.org/2001/XMLSchema#boolean> .

Trying it again with this request body does work (i.e. "true" replaced by "1"):

DELETE DATA {<https://vincent-test.inrupt.net/public/booleantest.ttl#me> <http://example.com/testbool> "1"^^<http://www.w3.org/2001/XMLSchema#boolean>.}; INSERT DATA {<https://vincent-test.inrupt.net/public/booleantest.ttl#me> <http://example.com/testbool> "false"^^<http://www.w3.org/2001/XMLSchema#boolean>.};