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Delay the evaluation of expressions to allow post facto changes to input variables
Recompute values as needed to use post facto changes to input variables
Delayed evaluation expressions are "collapsed" once observed
Put off computing a value as long as possible but throw errors if later changes are attempted


in lib/Data/Postponed/Util/
in lib/Data/Postponed/Util/ReadOnly/
in lib/Data/Postponed/Util/ReadOnly/