In the source mod_include.c, "SSILegacyExprParser" is defined as OR_LIMIT. But not documented as "Override: Limit". I'm not sure this directive was written actually for OR_LIMIT override, because it seems not suitable for "AllowOverride Limit" context. Maybe OR_ALL suitable? (I found SSILastModified and SSIEtag also marked as OR_LIMIT ...)