PdbInfo

        u32 age;       // must match PE codeview.age
        u8  guid[16];  // must match PE codeview.guid
    } PdbInfo;
    
    ///

        u32          block_size;
        u32          num_streams;
        PdbInfo      info;
        PdbFunctions functions;
        // `dir_stream_blocks` borrows from `data` (it's an array of u32

        // disagree the names are probably stale -- worse than no symbols.
        const PeCodeViewInfo *pe_cv   = PeCodeView(&entry->pe);
        const PdbInfo        *pdb_inf = PdbInfoStream(&entry->pdb);
        if (pe_cv->age != pdb_inf->age || MemCompare(pe_cv->guid, pdb_inf->guid, 16) != 0) {
            LOG_ERROR("PdbCache: GUID/age mismatch between PE and PDB for {}", entry->module_path);

        }
    
        const PdbInfo *pi = PdbInfoStream(&pdb);
        ok                = pi->version == 0x01020304;
        ok                = ok && pi->signature == 0x05060708;