dlmalloc 2.8.6 (Doug Lea, 2023 MIT-licensed release), from https://gee.cs.oswego.edu/pub/misc/malloc.c
sha256 be7be56b40b4b31417e74e77687f9b96127ea6cae534cf236aee40a4c739508d
Unmodified. src/dlmalloc/mspace.c configures it as one locked mspace whose
segments src/heap.c maps from direct memory.
