Don't call length if not needed (#2989)
* Don't call length if not needed * Use hasLengthGreaterThen * Use isNilOrSingleton * Use isNilOrSingleton * no double negations are not bad
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* Don't call length if not needed * Use hasLengthGreaterThen * Use isNilOrSingleton * Use isNilOrSingleton * no double negations are not bad