Fix for complex powers of symbolics

[karlwessel]

This fixes issue #717

[karlwessel]

Anything preventing this from merging?

[github-actions]

Benchmark Results

	master	5dbc0d5...	master / 5dbc0d5...
overhead/acrule/a+2	1.02 ± 0.32 μs	0.92 ± 0.32 μs	1.11 ± 0.53
overhead/acrule/a+2+b	1.2 ± 0.32 μs	0.904 ± 0.31 μs	1.33 ± 0.58
overhead/acrule/a+b	0.271 ± 0.026 μs	0.23 ± 0.012 μs	1.18 ± 0.13
overhead/acrule/noop:Int	1.56 ± 0.92 ns	1.56 ± 0.01 ns	1 ± 0.59
overhead/acrule/noop:Sym	26.9 ± 5.9 ns	28.3 ± 5.9 ns	0.948 ± 0.29
overhead/rule/noop:Int	0.0365 ± 0.024 μs	0.0361 ± 0.025 μs	1.01 ± 0.97
overhead/rule/noop:Sym	0.0336 ± 0.024 μs	0.0336 ± 0.024 μs	1 ± 1
overhead/rule/noop:Term	0.0337 ± 0.024 μs	0.0334 ± 0.024 μs	1.01 ± 1
overhead/ruleset/noop:Int	0.117 ± 0.0041 μs	0.122 ± 0.0047 μs	0.959 ± 0.05
overhead/ruleset/noop:Sym	0.128 ± 0.0045 μs	0.115 ± 0.0028 μs	1.11 ± 0.047
overhead/ruleset/noop:Term	4.68 ± 0.16 μs	8.03 ± 0.27 μs	0.583 ± 0.028
overhead/simplify/noop:Int	0.215 ± 0.015 μs	0.296 ± 0.03 μs	0.727 ± 0.09
overhead/simplify/noop:Sym	0.219 ± 0.016 μs	0.291 ± 0.03 μs	0.753 ± 0.096
overhead/simplify/noop:Term	0.0487 ± 0.0022 ms	0.0381 ± 0.0017 ms	1.28 ± 0.081
overhead/simplify/randterm (+, *):serial	0.121 ± 0.0043 s	0.0904 ± 0.003 s	1.33 ± 0.065
overhead/simplify/randterm (+, *):thread	0.0695 ± 0.0063 s	0.0505 ± 0.0044 s	1.37 ± 0.17
overhead/simplify/randterm (/, *):serial	0.236 ± 0.022 ms	0.229 ± 0.019 ms	1.03 ± 0.13
overhead/simplify/randterm (/, *):thread	0.272 ± 0.021 ms	0.244 ± 0.018 ms	1.12 ± 0.12
overhead/substitute/a	0.104 ± 0.012 ms	0.157 ± 0.017 ms	0.664 ± 0.11
overhead/substitute/a,b	0.0904 ± 0.011 ms	0.139 ± 0.015 ms	0.651 ± 0.1
overhead/substitute/a,b,c	21.5 ± 2.7 μs	0.0617 ± 0.0043 ms	0.348 ± 0.05
polyform/easy_iszero	0.0414 ± 0.0013 ms	0.0618 ± 0.0012 ms	0.671 ± 0.025
polyform/isone	3.11 ± 0.01 ns	2.79 ± 0.01 ns	1.11 ± 0.0053
polyform/iszero	1.42 ± 0.025 ms	1.95 ± 0.025 ms	0.729 ± 0.016
polyform/simplify_fractions	1.93 ± 0.033 ms	2.66 ± 0.043 ms	0.724 ± 0.017
time_to_load	1.16 ± 0.024 s	1.14 ± 0.016 s	1.02 ± 0.025

Benchmark Plots

A plot of the benchmark results have been uploaded as an artifact to the workflow run for this PR.
Go to "Actions"->"Benchmark a pull request"->[the most recent run]->"Artifacts" (at the bottom).