Comment #3 on issue 4342 by [email protected]: Patch: Replace C++ (in)equality
checks with proper SCM syntax
https://code.google.com/p/lilypond/issues/detail?id=4342
scm_is_true(x) is defined as !scm_is_false(x), so we cannot use it for
comparison with SCM_BOOL_T. Comparison with SCM_EOL is available in
GUILEv1 as scm_is_null. Comparison with SCM_UNDEFINED for better or worse
is SCM_UNBNDP(x).
Does ly_is_exact serve a significantly different purpose than
ly_is_rational?
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