Add builtin function abs
#2356
Merged
Add builtin function abs
#2356
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What I did
Add
absas a builtin function to get the absolute value of anint256.How I did it
Add
Abswithinvyper/functions/functions.py. The logic is fairly straightforward - the only possible overflow is with-2**255where we end up with the same value, so I do a check that the result is != the original value.How to verify it
Run the tests. I've added hypothesis tests to verify both the runtime and compile-time behaviour, including the happy path and the reverting path.
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