use Matrix API for (cholmod_factor *)->SEXP coercion #778
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The names and implementation details of factorization classes in Matrix may change as we generalize to support complex matrices. lme4 should use our API as much as possible to remain forward compatible.
Note that
M_chm_factor_to_SEXP
has been API since "the beginning" (Matrix 0.y-z), originally as a function but lately as a macro mapping toM_cholmod_factor_as_sexp
. Its use here does not require a stricter version dependency.