Track the number of generic signature builders “registered”
Track the number of generic signature builders “registered”

The number of generic signature builders “registered” indicates how many
times a generic signature builder (GSB) was moved in to become the canonical
GSB, rather than recreating the GSB. When a GSB is “already registered”, it
means that we’ve constructed a new GSB only to find that there already was
a canonical GSB for that particular generic signature. These latter cases
could potentially benefit from more caching.
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