4

From the solidity docs:

Calls are limited to a depth of 1024, which means that for more complex operations, loops should be preferred over recursive calls. Furthermore, only 63/64th of the gas can be forwarded in a message call, which causes a depth limit of a little less than 1000 in practice.

I know there are some security considerations for setting a limit on how much a callee can consume, but I'm curious to know why did they set the value to 63/64, specifically? Was it just efficient to divide by 64 and subtract the result?

2

There is link describing how 63/64 rule allowed to execute transaction but to waste a lot of gas instead of just failing: https://github.com/Synthetixio/synthetix/issues/243

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