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10.16.2 Conversion
General definitions
bool to_boolean (SCM b)
Return true if b is SCM_BOOL_T, else return false.
This should be used instead of scm_is_true and scm_is_false
for properties since empty lists are sometimes used to unset them.
[C type] ly_scm2[C type] (SCM s)
Behave the same as scm_to_[C type] would do if it existed.
[C type] robust_scm2[C type] (SCM s, [C type] d)
Behave the same as scm_to_[C type] would do if it existed. Return d if type verification fails.