Improve error messages and argument checking in .imuln()#207

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webmaster128 wants to merge 3 commits intoindutny:masterfrom

webmaster128:muln-asserts

Commits on Nov 29, 2018

Improve error messages for imuln argument range
Simon Warta
committed
Improve error message and add test for imuln argument type
Simon Warta
committed
Ensure argument of imuln is an integer
Simon Warta
committed