Registry key — override or remove by it. Namespace it ("vendor:games")
so independent libraries don't clobber each other; use() overwrites
silently on a duplicate id.
OptionalprepareLoad correlation data before resolve runs. If it rejects, this resolver
contributes no memberships.
Pure and synchronous. The groups this tx belongs to, or undefined to leave it plain.
A pluggable resolver keyed by
id.