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Prefix{u,v}2={w,x}:b:1
Prefix{u,v}2={w,x}:{y,z}:1
Prefix{u,v}2={w,x}:b:2
Prefix{u,v}2={w,x}:{y,z}:2

c:\@Work\Perl\monks\NorthernFox>perl -wMstrict -MData::Dump -le
"my @proto_globules = (
...
    "Prefix{u\\,v}2=x}:z}:2",
  ],
)

    still active! -------+------------+
                         |            |
...
                    ^        ^ ^          ^
                    |        | |          |
 in added curlies --+--------+-+----------+