747ea853b5
This PR adds extensional hash maps and hash sets under the names `Std.ExtDHashMap`, `Std.ExtHashMap` and `Std.ExtHashSet`. Extensional hash maps work like regular hash maps, except that they have extensionality lemmas which make them easier to use in proofs. This however makes it also impossible to regularly iterate over its entries. |
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| Basic.lean | ||
| Lemmas.lean | ||