Consider .defined, not just .DEFINITE, when deciding whether to run KEEP/UNDO phasers. Fixes fail() not triggering UNDO, and that in turn fixes the 'let' handling.
Consider .defined, not just .DEFINITE, when deciding whether to run KEEP/UNDO phasers. Fixes fail() not triggering UNDO, and that in turn fixes the 'let' handling.

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