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[spec] Add exactness variables for principal types - #129
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Enrich the principal types grammar in the appendix with exactness type variables (\alpha_{exact}) and exact type uses so that instructions like ref.get_desc that preserve exactness across concrete heap types have principal type schemes.
rossberg
approved these changes
Nov 5, 2026
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Enrich the principal types grammar in the appendix with exactness type variables (\alpha_{exact}) and exact type uses so that instructions like ref.get_desc that preserve exactness across concrete heap types have principal type schemes.