Add a changelog entry

IntersectMBO · Apr 25, 2024 · e507dae · e507dae
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diff --git a/...0240425_183853_effectfully_both_MajorProtocolVersion_and_multiple_CostModels.md b/...0240425_183853_effectfully_both_MajorProtocolVersion_and_multiple_CostModels.md
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+### Changed
+
+`EvaluationContext` now contains:
+
+- `PlutusLedgerLanguage` -- a ledger language
+- `MajorProtocolVersion -> BuiltinSemanticsVariant DefaultFun` -- a function returning a semantics variant for every protocol version
+- `[(BuiltinSemanticsVariant DefaultFun, DefaultMachineParameters)]` -- a cache of machine parameters for each semantics variant supported by the ledger language
+
+Similarly, `mkDynEvaluationContext` now takes additional arguments:
+
+- `PlutusLedgerLanguage` -- same as above
+- `[BuiltinSemanticsVariant DefaultFun]` -- a list of semantics variants supported by the ledger language
+- `MajorProtocolVersion -> BuiltinSemanticsVariant DefaultFun` -- same as above
+
+All this allows us to improve the accuracy of costing in future protocol versions without introducing new ledger languages.