Array-parameters with string-items are falsely split on every comma about connexion HOT 2 OPEN

Meanwhile I did a little debugging which brought me to an experiment: I changed the value for QUERY_STRING_DELIMITERS['form'] in the file uri_parsing.py from "," (comma) to a less common/likely string like "|||" (three pipes) and could observe that the erroneously split disappeared. But to be honest, I am not very experienced with elaborate testing nor with all the multiple possible query-formats, so I cannot overlook the consequences of such a modification.

But digging through the code raised a question for me: I don't really understand, why at all - speaking for the form-request-style - in the process of URI-parsing the parameters-array is joined to a string first, just to be exploded back into an array a little later. Could anyone explain to me what's the reason behind this?

from connexion.

For anyone running into this issue, here is a workaround by defining a custom URI-parser-class within our app. We abstract the OpenAPIURIParser and re-define the delimiter by re-assigning a value to the delimiter-dictionary (which is very bad practice as this is supposed to be a constant):

from connexion.uri_parsing import OpenAPIURIParser, QUERY_STRING_DELIMITERS

class OpenAPIURIParserMod(OpenAPIURIParser):
  
  def __init__(self, param_defns, body_defn):
    super().__init__(param_defns, body_defn)
    QUERY_STRING_DELIMITERS['form'] = '|||'

and in app.py:

from .parsers.OpenAPIURIParserMod import OpenAPIURIParserMod

app = AsyncApp(
  __name__,
  # any other options
  uri_parser_class=OpenAPIURIParserMod,
)

from connexion.