The complexity of the last round of property initialization code was
starting to bug me. I've switched away from lazily initializing them
and now eagerly initialize at the proper times: module initialization,
class initialization (for statics), and object allocation (for instances).
This includes the logic around readonly and freezing. The code is a
lot simpler now and actually enforces some invariants that we'd like to
enforce, like not silently adding new properties when a supposedly static
member load is happening (all such accesses should be dynamic ones).
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