ad_page/include_contract argspec parsing reform: allow arbitrary characters in the argspec flag parametersThis reform allows to specify an argspec containing pipes, parenthesys and other so far forbidden characters as parameters for a flag. The purpose is to enhance the expressiveness of existing validators (e.g. the oneof validator) and enable new one, for instance, a date validator using a clock format as parameter.Pipes and parenthesys need to be escaped via the backslash character in the new syntax.
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