The Value type holds pointers but currently has alignment of 1. Since LSAN by default only looks for pointers in aligned addresses, it can report false-positive leaks of memory pointed to by a misaligned Value. This will be fixed by giving Value at least pointer alignment.
Original title: Use use_unaligned for LSAN
Pointers to the RCString class may be stored in memory not aligned to 8 bytes, and therefore LSAN does not mark the RCString as reachable. This results in false positive leak reports.
To fix, pass "use_unaligned=1" in the LSAN_OPTIONS environment variable.