TZUTC: -0800
MSGID: 59112.sync_sys@1:103/705 2dbda606
PID: Synchronet 3.21a-Linux master/48922a15c Dec 17 2025 GCC 12.2.0
TID: SBBSecho 3.34-Linux master/8bb133aa7 Dec 30 2025 GCC 12.2.0
BBSID: VERT
CHRS: UTF-8 4
FORMAT: flowed
https://gitlab.synchro.net/main/sbbs/-/issues/685#note_8072

So, I didn't find any evidence that SpiderMonkey is using the `A
DR_COMPAT_LAYOUT` method, it it possible they're using a specific `mmap()`
flag when allocating to constrain pointers to 47 bits?
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