omry / omegaconf / 0bc41be8-4d9b-4bd4-a2c3-a203abcb6856

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Limit YAML alias expansion (#1296)

Add YAML loader checks that cap expanded node construction at 10,000 nodes and reject documents whose aliases amplify the parsed document by more than 100x after 1,000 expanded nodes. Document the limits and trusted-input escape hatch, and cover normal aliases, merges, recursive aliases, absolute-limit rejection, amplification rejection, and disabled-limit behavior in tests.

Closes #794

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