Cardinality support

[fliiiix]

For radish we wrongly documented that it is possible to combine the standard types from parse with a cardinality

These standard types can be combined with the following cardinalities:
"{numbers:d}" #< Cardinality: 1 (one; the normal case)
"{number:d?}" #< Cardinality: 0..1 (zero or one = optional)
"{numbers:d*}" #< Cardinality: 0..* (zero or more = many0)
"{numbers:d+}" #< Cardinality: 1..* (one or more = many)

Which might have worked somehow or maybe according to my digging was wrong since the start.
radish-bdd/radish#130

Now parse itself does obviously not support any cardinality functions but parse_type from @jenisys does.
But it seems that parse_type is not able to add cardinality to the default types because of the design of parse

The information for the built-in types in the parse module are deeply embedded in the implementation and not easily accessible.
jenisys/parse_type#9 (comment)

My question would be if there is any interest in making the built-in types more accessible in a way parse_type could consume?

[wimglenn]

Well, since there is an easy workaround (stick to user-defined types) and there has not been much interest since those 2017 issues... If someone can do it in a clean and tested way I'm not against the idea, but I'm not too interested in working on this myself as a maintainer.

[fliiiix]

Perfect i linked this issue from radish documentation, if someone wants support for that they should contribute that :D I assume there are a few users a year which would like to use that but as it is simpler for everyone to work around it i assume that's what most of them do

if i find time i will give it a try but this also has very low prio for me personally