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Tom Lane authored
The syntax summaries for CREATE FUNCTION and allied commands made it look like LEAKPROOF is an alternative to IMMUTABLE/STABLE/VOLATILE, when of course it is an orthogonal option. Improve that. Per gripe from aazamrafeeque0. Thanks to David Johnston for suggestions. Discussion: https://postgr.es/m/162444349581.694.5818572718530259025@wrigleys.postgresql.org
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