* Improve documentation for math
Support empty input for cumsummed
Use runnableExamples
Move some examples to tests
Add more tests
* Update tests/stdlib/tmath.nim
Move some tests to trandom.nim
Move tests into main template where possible
Add test for #17017
* Add more tests for gamma & lgamma
Remove gamma(-1.0) example
Small fixes/changes
* Move more tests into template main()
* Fix typos
* Add edge case examples for copySign