What does it mean to "match […] against the remote end definition"

[gsnedders]

e.g., "Match parsed against the remote end definition. If this results in a match:"

What does it mean to "match" against it? When does the match fail? Is an extra property a failure? https://tools.ietf.org/html/rfc8610#section-4.2 deliberately leaves this up to the application, so we need to define this.

[jgraham]

I think the intent (but not the current status) is to make all the definitions contain {*text: any} so extra properties are expliclty ignored.