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There are four weaknesses in728f152e07f998d2cb4fe5f24ec8da2c3bda98f2: * append_init() in heapdesc.c was ugly and required that rm_identify return values are only valid till the next call. Instead just add a couple more switch() cases for the INIT_PAGE cases. Now the returned value will always be valid. * a couple rm_identify() callbacks missed masking xl_info with ~XLR_INFO_MASK. * pg_xlogdump didn't map a NULL rm_identify to UNKNOWN or a similar string. * append_init() was called when id=NULL - which should never actually happen. But it's better to be careful.