Rely on user names for projection table in extraction. #21191
Merged
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The previous code was probably buggy, because the corresponding inductive table uses user names, so there might have been a desynchronization. That said, it is not even clear because the data is the same for aliased inductive types, and was not even accessed by the code. So this change should be a no-op. To make this clearer, we seize the opportunity to replace maps with sets.