XSLoader
::load
'PerlIO::scalar';
PerlIO::scalar - support module for in-memory IO.
open($fh,"<:scalar",\$scalar);
open($fh,">:scalar",\$scalar);
C<PerlIO::scalar> only exists to use XSLoader to load C code that provides
support for treating a scalar as an "in memory" file.
All normal file operations can be performed on the handle. The scalar
is considered a stream of bytes. Currently fileno($fh) returns C<undef>.