Adds all() that accepts 4 heterogenous values

[EthanLozano]

Fixes #61

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[EthanLozano]

I signed it!

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CLAs look good, thanks!

[EthanLozano]

I'm not too proud of this code since it is just copy-pasted from the heterogeneous 3 version. But, it wasn't immediately obvious how I could have code re-use, so I just went with a quick and dirty solution.