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Even after #3409 there are still integer overflows in mrb_ary_splice, as the following input demonstrates:
a =  * 0x40000001
a[0x40000000,0x40000000] = 
This crashes because head + len overflows here:
head + len
and also here:
I don't think the fix is quite right, but I couldn't find a way to exploit it. Comments are in the commit.
b0f918d addressed the concern.
Thank you for reporting and fixing!