p6doc Str weirdness

p6doc-output.console

% export POD_TO_TEXT_ANSI=1
% p6doc Str
In Str
% PAGER=cat p6doc Str
In Str
===FATAL: Table 4 has a mixture of visible and invisible column-separator types.
===SORRY!===
1
   space   prefix non-negative number with a space
   +       prefix non-negative number with a plus sign
   -       left-justify within the field
   0       use leading zeros, not spaces, for required padding
   #       ensure the leading "0" for any octal,
           prefix non-zero hexadecimal with "0x" or "0X",
           prefix non-zero binary with "0b" or "0B"
===end FATAL table 4 input