in reply to Re^11: The fallacy of the *requirement* for read-only instance variables.
in thread The fallacy of the *requirement* for read-only instance variables.

numbers being immutable.

Same address, different value. In Perl, numeric variables are mutable. 

C:\test>perl -MDevel::Peek -E"my $x = 12345; Dump $x; $x ^= 1; Dump $x
+"
SV = IV(0x2174e0) at 0x2174e8
  REFCNT = 1
  FLAGS = (PADMY,IOK,pIOK)
  IV = 12345
SV = IV(0x2174e0) at 0x2174e8
  REFCNT = 1
  FLAGS = (PADMY,IOK,pIOK)
  IV = 12344

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