Have variables consistent by default outside slurps

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The main reason I made consistency optional is because of slurps, because when one writes (*{x},), they probably mean a tuple of any sequence of elements, not a sequence of the same element. However, when one writes (x,x), they likely mean a tuple of two of the same element, so maybe it's best to have consistency be the default outside slurps, and nonconsistency on the inside.

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Maybe a better solution would be to have variables inside slurps match the entire sequence of values rather than each individually, e.g. Given the expression (1,1,1), x in (*{x},) matches [1,1,1], rather than 1 three times. That would make it consistent with destructuring. Then I could change the meaning of :C{x} to "sequence of the same element", or maybe just remove it, I don't know whether that's useful enough to have special syntax.

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Mostly done, but :(*{x},*{x}), which would match :(1,2,1,2), :(a,b,c,a,b,c), etc, doesn't work yet.