delete and view min/max

[matthewleon]

Allows for log(n) deletion and plucking of min and max pairs from maps.

[matthewleon]

Leaving a note here that minView and maxView aren't getting TCO'd because of this: purescript/purescript#3157

Given that the number of recursive steps is O(log(number of elements)) this is probably fine.

[natefaubion]

You could just use unsafeCrashWith for the ommitted case instead of unsafePartial on the expression. Since we don't propagate the Partial constraint there's not really a difference.

[matthewleon]

You could just use unsafeCrashWith for the ommitted case instead of unsafePartial on the expression.

Thanks! That worked.