Looking at v1-0003-WIP-Base-LWLock-limits-directly-on-MAX_BACKENDS.patch,
I'm curious about the following assert;

> #define LW_VAL_EXCLUSIVE (MAX_BACKENDS + 1)
...
> StaticAssertDecl(MAX_BACKENDS < LW_VAL_EXCLUSIVE,
  "MAX_BACKENDS too big for lwlock.c");

Since LW_VAL_EXCLUSIVE is already defined as MAX_BACKENDS + 1, is this
basically just checking for an integer overflow?

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