Inconsistent MSH format spec

Dear Gmsh developers,

I am the author of MshIO, a stand alone IO library supporting MSH file format in both ASCII and binary, for both version 2.2 and version 4.1. I noticed an inconsistency in the format spec for binary 4.1 on how node/element data are stored. See my original finding here.

In short, the spec stated elementTag and nodeTag is of type size_t, i.e. 8 bytes on my macbook. However, Gmsh 4.7.1 seems to expect int32_t, i.e. 4 bytes, based on trial and error. I appreciate any clarification on how to handle this issue.

best, Qingnan (James) Zhou