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The Generalized Greenspun Rule: Any sufficiently complicated platform contains an ad hoc, informally-specified, bug-ridden, slow implementation of half of a functional programming language.
While Ruby provides an ad hoc, informally-specified, bug-ridden, slow implementation of half of higher-order functional programming, it lacks an ad hoc, informally-specified, bug-ridden, slow implementation of half of Monads.
