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Now that the result of pg_newlocale_from_collation() is always non-NULL, then we can move the collate_is_c and ctype_is_c flags into pg_locale_t. That simplifies the logic in lc_collate_is_c() and lc_ctype_is_c(), removing the dependence on setlocale(). This commit also eliminates the multi-stage initialization of the collation cache. As long as we have catalog access, then it's now safe to call pg_newlocale_from_collation() without checking lc_collate_is_c() first. Discussion: https://postgr.es/m/cfd9eb85-c52a-4ec9-a90e-a5e4de56e57d@eisentraut.org Reviewed-by: Peter Eisentraut, Andreas Karlsson