Spaces in FileMaker Variable Names

I just came across an interesting little FileMaker quirk. The "Set Variable" script step does not allow you to begin the variable name with a space. But you can declare variables with the Let Statement can also declare variables and they can start with a Space.

For example:

If you try to use the "Set Variable" script step to declare this variable "$$ StartedWithSpace", it will not let you. However if you evaluate the following Let Statement:

Let( [ $$ StartedWithSpace = "this will work" ]; 0 )

It will work just fine.

While this is strange, I am not sure that it useful. In fact my gut tells me it is a bad idea to have variable names start with a space. So I am going to avoid them.