Revisit "+" in the type

[pombredanne]

A plus '+' in a type looks like a wart and is not used in any type, and may go against encoding rules and would make things weird given that + is also treated as an encoded space

[jkowalleck]

given that + is also treated as an encoded space

since when?
in URL - yes.
in PURL - not yet. PURL clearly states to use percent-encoding for al permitted charactes. space is a permitted character and is encoded as %20

• see Clarify "Character encoding" section #438

[matt-phylum]

PURL never said to do it, but some implementations (still) have bugs where + is changed into or is changed into +. #261

[pombredanne]

so now that we have a clear set of encoding rules, I think there is no purpose to support a + in the type at all. We will submit a PR to update this line:

• purl-spec/PURL-SPECIFICATION.rst

  Line 137 in b8a50ec

  period '.', plus '+', and dash '-'.

.... and remove the + from supported characters in the type, unless there is a strong objection!

@johnmhoran ping