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I wonder if it's possible to sub-class the Symbol class in order to override the <=> operator method to create a sub-set of Symbols that have a custom order/priority:

class VersionModifier < Symbol

ORDER = [:pre, :alpha, :beta, :rc]

def <=>(other)
ORDER.fetch(to_sym) <=> ORDER.fetch(other.to_sym)
end

end

Still not sure how you'd handle initializing or mapping plain Symbols to your sub-classed Symbols.