Allow log/pow on negative scale decimals #19250
Description
Is your feature request related to a problem or challenge?
#17023 introduced handling of decimals for log natively; previously we'd cast the input to float before performing the log.
It introduced a condition against negative scale decimals, as the implementation couldn't yet handle them. This is technically a regression as previously we could handle them via casting to float before doing the log.
Describe the solution you'd like
Short term solution: for negative scale decimals, cast to float to perform log
Long term/proper solution: improve decimal log code to handle negative scales
Additional context
Same for pow: #18032