yes, they're identical copies 
$ perl -le "sub LUCY(){66} use threads; async{ print join q/ /, thread
+s->tid, LUCY(), \&LUCY() } for 1..3; sleep 1; "
1 66 SCALAR(0xb6c0d4)
2 66 SCALAR(0xbf7144)
3 66 SCALAR(0xc7eebc)
Perl exited with active threads:
        0 running and unjoined
        3 finished and unjoined
        0 running and detached

[download]

$ perl -le "use Readonly; Readonly::Scalar $LU => 66; use threads; asy
+nc{ print join q/ /, threads->tid, $LU, \$LU } for 1..3; sleep 1; "
1 66 SCALAR(0xb84cfc)
2 66 SCALAR(0xc1bbec)
3 66 SCALAR(0x10af0b4)
Perl exited with active threads:
        0 running and unjoined
        3 finished and unjoined
        0 running and detached

[download]

In reply to Re^4: XS: exposing C++ library constant as package variable by Anonymous Monk
in thread XS: exposing C++ library constant as package variable by wisnij

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