Fix #28: Check the elements of X

[ghost]

I fixed #28 by adding the error handling to check the elements of X.

[ghost]

@andreasnoack Thank you for correcting the code appropriately.

[mileslucas]

just an FYI this resulted in breaking changes downstream in my package. I didn't notice it until my CI started failing on a PR for a docs update, since the version was bumped to 0.4.2 instead of 0.5.

[andreasnoack]

While it could also be this PR that has caused the breakage, my guess is that it is #38 that caused it. I added [Breaking] to the title of that PR to indicate that it was breaking but I should also have mentioned it in a comment. @ararslan I might be a good area to make a 0.4.3 release prior to the breaking change and then a new 0.5 release.

[ararslan]

So register a 0.5.0 off of master and a 0.4.3 based on the commit prior to that PR?

[ararslan]

I'm yanking 0.4.3 from the registry (JuliaRegistries/General#24448) and will reregister current master as 0.5.0.

[ghost]

Thank you!! I really appreciate your help in resolving the problem.