Narrow a presented binding's confirmation to the member its mechanism
kind owns, or undefined when the kind owns no recognized member (a
third-party mechanism) or the confirmation lacks that member.
This is the value a grant may stamp onto a token it issues for the
request: material the owning mechanism actually validated. The kind
gating is the same boundary matchConfirmation enforces.
Narrow a presented binding's confirmation to the member its mechanism
kindowns, orundefinedwhen the kind owns no recognized member (a third-party mechanism) or the confirmation lacks that member.This is the value a grant may stamp onto a token it issues for the request: material the owning mechanism actually validated. The kind gating is the same boundary matchConfirmation enforces.