$parseInteger fails with "#" picture string

[michaelblight]

I'm doing this from Node Red, which is using JSONata 1.6, so this may have been fixed, but I cannot confirm.

$parseInteger("50", "#") produces the following error:

Invalid JSONata expression: matchSpec.parse is not a function.

After some investigation I found $formatInteger(50, "#") is not handled, but produces a better error message:

Invalid JSONata expression: Formatting an integer as a sequence starting with "#" is not supported by this implementation

This looks like error D3130, and since this error still exists in 1.7, I'm guessing the other error still occurs too. Is it possible to improve the error message?