Why can't a list of numbers be combined?

[trevordevore]

I am generating a list from a string and then converting the list to a list of numbers:

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put tList parsed as list of number into tList

I then want to combine that list later on in order to output it as a string.

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combine tList with ","

When I do, however, I get the following error:

"cannot combine list with non-string elements"

I would think that the numbers could be converted to strings for me. Is this a bug, intended behavior, or "not implemented yet" behavior?

[peter-b]

Is this a bug, intended behavior, or "not implemented yet" behavior?

I believe this is "not implemented yet" behaviour.