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# Description Fixes #11267 Shifting by a `shift >= num_bits` is undefined in the underlying operation. Previously we also had an overflow on negative shifts for the operators `bit-shl` and `bit-shr` Furthermore I found a severe bug in the implementation of shifting of `binary` data with the commands `bits shl` and `bits shr`, this categorically produced incorrect results with shifts that were not `shift % 4 == 0`. `bits shr` also was able to produce outputs with different size to the input if the shift was exceeding the length of the input data by more than a byte. # User-Facing Changes It is now an error trying to shift by more than the available bits with: - `bit-shl` operator - `bit-shr` operator - command `bits shl` - command `bits shr` # Tests + Formatting Added testing for all relevant cases