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  =head1 CHOOSING BACKEND
  
  This module respects an environmental variable called C<PERL_JSON_BACKEND>
  when it decides a backend module to use. If this environmental variable is
  not set, it tries to load JSON::XS, and if JSON::XS is not available, it
  falls back on JSON::PP, and then JSON::backportPP if JSON::PP is not available
  either.
  
  If you always don't want it to fall back on pure perl modules, set the
  variable like this (C<export> may be C<setenv>, C<set> and the likes,
  depending on your environment):
  
    > export PERL_JSON_BACKEND=JSON::XS
  
  If you prefer Cpanel::JSON::XS to JSON::XS, then:
  
    > export PERL_JSON_BACKEND=Cpanel::JSON::XS,JSON::XS,JSON::PP
  
  You may also want to set this variable at the top of your test files, in order
  not to be bothered with incompatibilities between backends (you need to wrap