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L<output_layers|/output_layers> attribute for the rationale for this.

B<Caveat:> redirection tests fail under MSWin32 -- or at least they did
until I bypassed them under that operating system. I do not know if this
is a failure of the redirection mechanism or a problem with the test. I
suspect the latter, but will welcome evidence of the former.

Any unquoted token or redirection file name which begins with a tilde
(C<~>) has tilde expansion performed on everything up to the first slash
(C</>), or the end of the token, B<provided> the operating system
supports this.  The empty username is expanded using C<getpwuid()> if
this is supported, or various possibly-OS-specific environment variables
if not. Non-empty user names are expanded if C<getpwnam()> is supported
B<and> the user actually exists; otherwise an exception is raised. Tilde
expansion is not done inside quotes (either single or double), even if
the tilde is the first character. This is consistent with C<bash(1)>.

As special cases of tilde expansion, C<~.> expands to the current
directory, and C<~~> expands to the configuration directory. The
expansion of C<~~> will throw an exception if the configuration
directory does not exist.