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[ddlm-group] Removing comma from non-delimited strings

Dear DDLm group,

As foreshadowed in the comma-as-list-delimiter discussion, I would
like to suggest adding comma to the list of disallowed characters in
non-delimited text strings, for the following reasons:

(1) This will improve human readability inside lists if the data value
contains commas, for example:

_my_numbers = [1,2,3,4,5,6,7]

is a single-element list although it will appear to be a 7 element
list to all but a CIF2 expert.

(2) Robust CIF2 programs can interpret commas as list delimiters
without danger of misinterpretation.
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