The Synopsis for Readonly 1.03 and 2.00 do in fact show this form: 

# Alternate form (Perl 5.8 and later)
Readonly    $sca => $initial_value;
Readonly my $sca => $initial_value;
Readonly    @arr => @values;
Readonly my @arr => @values;
Readonly    %has => (key => value, key => value, ...);
Readonly my %has => (key => value, key => value, ...);

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Readonly-1.03 Readonly-2.00

In reply to Re^2: Readonly oddity by Mr. Muskrat
in thread Readonly oddity by Anonymous Monk

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