Yeah. This one has bothered me, too. I suppose you could do something like this (untested):

sub is(&) { return $_[0] }
sub goal { ... }

# ...

goal 'foo' is { ... }
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but it's not quite as nice. Option 2: write a source filter that takes

goal mygoal
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and replaces it with

goal 'mygoal', sub
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That might be a good way to go.

/s