Ah, you have added RPMSIGTAG_RESERVEDSPACE already which I was not expecting.

The (minor but annoying problems) with the assignment to 1008 is that 
RPMSIGTAG_RESERVEDSPACE collides with RPMTAG_INSTALLTIME, and will not sort 
correctly to the end of an immutable region data section as a "free space" tag 
through headerReload-like operations if any other RPMSIGTAG_FOO is defined. 
Meanwhile -- because of the tagno assignment collisions between signature and 
metadata headers -- its rather unlikely that any other RPMSIGTAG_FOO 
assignments will ever be needed.

The functionally equivalent RPMTAG_SIGPADDING was assigned 0x3fffffff for 
uniqueness and to permit assigned metadata tags (e.g. RPMTAG_PUBKEYS) to be 
more easily moved between signature and metadata headers without explicit 
remapping.

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