Issue when trying to use boolean argument for behavior in an expression

Describe the bug

I cannot use true or false (or True, TRUE, …) in an expression when calling a function from an extension in an expression. It is quite minor, but as there is a warning that I should call a maintainer, I post this:

Steps to reproduce

  • create an extension

  • create a function in the extension, add a boolean True False argument

  • call this function through an expression

Boolean in formulas is a valid feature request but, actually, the “extension developer” is you. This message is meant for extensions from the store.

Does this mean it’s not available as a parameter in formulas? If that’s the case, why is it an option in the parameter type drop down in the extension definition?