[TxMt] perl "=>" operator

[Grant Hollingworth]

perlop(3):

    The "=>" operator is a synonym for the comma, but forces any word (con-
    sisting entirely of word characters) to its left to be interpreted as a
    string (as of 5.001). This includes words that might otherwise be con-
    sidered a constant or function call.
    
For example:

    {
      format => 'html',
      server => 'localhost',
    }

Currently, 'format' has a scope of support.function.perl, while 'server' is source.perl.

\b\w+\s*=> would match, but would should the scope be?  string.quoted.other?  And how to give it higher precedence than support.function.perl?