Added value checks for "rect" and "roundrect" #62
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Issue description
I encountered some bugs that were caused by user input errors (e.g. automatically assigning widths and heights => 0), leading to issues that were challenging to diagnose due to the lack of clear error messages. To address this, I have added checks for the "rect" and "roundrect" functions.
Added checks
These checks aim to ensure the correctness of incoming values and provide error messages if they are out-of-spec.