Suricata

When doing a size comparison with dsize or bsize one might want to reference a variable extracted with byte_math or byte_extract.

An example use case: you have protocol with a size field. Such field you might want to compare with the payload/packet size. Either to ensure it's actually that protocol you are looking for or to detect anomalies indicating something like overflow attacks.

Alternatively having a to having that feature at dsize and bsize an implementation at byte_test to compare against those size values would be equality helpful.