⌊raku --doc=Markdown ⋯⌉ produces some improper Markdown

markdown-test.rakumod

=begin pod

⌊raku --doc=Markdown ⟨this file⟩⌉ produces
improper Markdown for the beginning here;

        Indented
    Baz

        Indented
    Foo

        Indented
    Jub

=end pod

# --------------------------------------------------------------------
=finish

Result:

- --------------------------------------------------------------------
⌊raku --doc=Markdown ⟨this file⟩⌉ produces improper Markdown for the beginning here;

    Indented

    Baz

        Indented
    Foo

        Indented
    Jub

- --------------------------------------------------------------------

Turns out this may actually be done by rakudo's Pod::To::Text.
After some experimentation, it appears that otherwise unmarked Pod text
having leading spaces on some lines may get reformated in hard to predict
ways, so I'll just wrap such sections with =begin code and =end code.