FIELDS / TYPEDFIELDS fail on const fields of mutable struct

[i9e1]

Since v"1.8.0" its possible to annotate a mutable struct's field with the const keyword.

If you do, DocStringExtensions FIELDS, TYPEDFIELDS fail: docstrings are only parsed for mutable fields.
Here is a MWE tested with julia v"1.9.2" and DocStringExtenions v"0.9.3".

julia> """Minimal Working Example to demonstrate `const` keyword on mutable struct with fields $(FIELDS) and typed $(TYPEDFIELDS)"""
       mutable struct MWE
           "This is not shown"
           const a::Real
           "This works as it should"
           b::Real
       end;

julia>

help?> MWE
search: MWE

  Minimal Working Example to demonstrate const keyword on mutable struct with fields

    •  a

    •  b: This works as it should

  and typed

    •  a::Real

    •  b::Real: This works as it should

[MichaelHatherly]

This is an upstream issue from what I can tell:

julia> """Minimal Working Example to demonstrate `const` keyword on mutable struct with fields"""
              mutable struct MWE
                  "This is not shown"
                  const a::Real
                  "This works as it should"
                  b::Real
              end;

help?> MWE.a
  MWE has fields a, and b.

help?> MWE.b
  This works as it should

MWE.a should give the attached docs, just like MWE.b does. It doesn't. We can't fix anything in DocStringExtensions.jl until that issue is fixed.