Negates any performed evaluations that are performed in the assertion chain.
This operation applies a stateful change to the evaluation chain, meaning
that subsequent operations that would normally fail will pass without the need
for them to "implement" any knowledge about the not
operation. You may call
not
multiple times to negate the negation.
Represents an operation that retrieves the keys of an object or an array.
Template: R
The type of the result of the operation.