Optimize type checking #858
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Check tail argument in case when first argument is matched by expecting meta type. Add fast check for number of arguments expected.
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First step to optimize type checker. It should improve performance in complex cases in about 6 times (see #850).
PR changes code to calculate children types only once. Also it fixes but in type checker: when one of the arguments is checked by meta type all other arguments are not checked. This bug probably not visible in real cases because interpreter has other type-checking algorithm.