Command/ mathdoubleextensible

All issues with:

• \doublebar on the mailing list (all results)
• \doublebar on the mailing list (subject only)
• \doublebar on stack exchange
• \doublebar in ConTeXt's source

• \doublebrace on the mailing list (all results)
• \doublebrace on the mailing list (subject only)
• \doublebrace on stack exchange
• \doublebrace in ConTeXt's source

• \doubleparent on the mailing list (all results)
• \doubleparent on the mailing list (subject only)
• \doubleparent on stack exchange
• \doubleparent in ConTeXt's source

• \doublebracket on the mailing list (all results)
• \doublebracket on the mailing list (subject only)
• \doublebracket on stack exchange
• \doublebracket in ConTeXt's source

• \overbarunderbar on the mailing list (all results)
• \overbarunderbar on the mailing list (subject only)
• \overbarunderbar on stack exchange
• \overbarunderbar in ConTeXt's source

• \overbraceunderbrace on the mailing list (all results)
• \overbraceunderbrace on the mailing list (subject only)
• \overbraceunderbrace on stack exchange
• \overbraceunderbrace in ConTeXt's source

• \overparentunderparent on the mailing list (all results)
• \overparentunderparent on the mailing list (subject only)
• \overparentunderparent on stack exchange
• \overparentunderparent in ConTeXt's source

• \overbracketunderbracket on the mailing list (all results)
• \overbracketunderbracket on the mailing list (subject only)
• \overbracketunderbracket on stack exchange
• \overbracketunderbracket in ConTeXt's source