Hello,

This is a noob question, but I'm trying to set a low heap size (4MiB) for 
an embedded application and I can't seem to succeed.

I also tried setting both a near limit callback and a GC epilogue and they 
don't get called.

I am initializing the Isolate with constraints set 
via ConfigureDefaultsFromHeapSize with both initial and max heap sizes set 
to 4MiB.

I'm trying to run a script that has just "a = Array(20000000).fill(2)".

Heap statistics right after Isolate initialization:

total_heap=962560 total_heap_executable=524288 total_physical=438272 
total_available=4246240 total_global_handles=0 used_heap=371424 
heap_limit=4194304 malloced=16460 external=0 peak_malloced=8192 
native_ctx=0 detached_ctx=0 zap_garbage=0

Heap statistics right after running the script:

heap total_heap=41496576 total_heap_executable=524288 
total_physical=40568044 total_available=485100 total_global_handles=8192 
used_heap=40900828 heap_limit=4194304 malloced=16460 external=0 
peak_malloced=49208 native_ctx=1 detached_ctx=0 zap_garbage=0

Note that the total heap size is 40 MiB, despite the limit being 4 MiB.

Am I doing something obviously wrong? This is v8 10.0.139.15.

Thanks,
-Tudor.

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