lean4/releases_drafts/environment.md

Breaking Changes

• The functions Lean.Environment.importModules and Lean.Environment.finalizeImport have been extended with a new parameter loadExts : Bool := false that enables environment extension state loading. Their previous behavior corresponds to setting the flag to true but is only safe to do in combination with enableInitializersExecution; see also the importModules docstring. The new default value false ensures the functions can be used correctly multiple times within the same process when environment extension access is not needed. The wrapper function Lean.Environment.withImportModules now always calls importModules with loadExts := false as it is incompatible with extension loading.