arithmetic: fix PerThing pow (#9030)
* arithmetic: add failing test for pow
* arithmetic: fix PerThing::pow
* Revert back to previous optimisations
Co-authored-by:
Gav Wood <gavin@parity.io>
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* arithmetic: add failing test for pow
* arithmetic: fix PerThing::pow
* Revert back to previous optimisations
Co-authored-by:
Gav Wood <gavin@parity.io>