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Plack::TempBuffer - temporary buffer to save bytes
my $buf = Plack::TempBuffer->new($length);
my $size = $buf->size;
my $fh = $buf->rewind;
Plack::TempBuffer is a buffer class to store arbitrary length of byte strings and then get a seekable filehandle once everything is buffered. It uses PerlIO and/or temporary file to save the buffer depending on the length of the size.