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[spec] Update validation algorithm for descriptors - #130
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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.
Update the validation algorithm pseudocode in the appendix with exact concrete heap types, descriptor types, relaxed br_on_cast, exact struct.new, and representative cases for ref.get_desc, ref.cast_desc_eq, br_on_cast_desc_eq, and struct.new_desc.
rossberg
approved these changes
Nov 6, 2026
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Update the validation algorithm pseudocode in the appendix with exact concrete heap types, descriptor types, relaxed br_on_cast, exact struct.new, and representative cases for ref.get_desc, ref.cast_desc_eq, br_on_cast_desc_eq, struct.new_desc, and ref.func.