PostGIS uses -1 as the default "unknown" SRID. Unfortunately, ISO uses 0. So we remain tempted to flip to 0. It is the one of the major "breaking" changes we would have to do to get to SQL/MM conformance (the others are changing the type numbers for ZM geometry variants in AsBinary).
Ok, I updated WkbReader to set the SRID to 0 (instead of -1) when it is not included in the EWKB/HEX value.
Charlie
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