i have the following:

contract Example {
    function A() external {
        (bool success,) = address(this).call{gas: 1_000_000}(abi.encodeWithSelector(this.B.selector));
        console.log("A", success);
    }

    function B() external {
        console.log("i have", gasleft());
        (bool success,) = address(this).call{gas: 10_000_000}(abi.encodeWithSelector(this.useInfiniteGas.selector));
        console.log("B", success);
        console.log("ok", gasleft());
    }

    function useInfiniteGas() external view {
        console.log("i am given", gasleft());
        while (true) {}
    }
}

after calling A(), i would expect A to be false and B to never print
but instead i get

  i have 999817
  i am given 980422
  B false
  ok 14714
  A true

it seems like despite me setting 10M gas for B, it actually only got 980422, which has enough left to let A succeed. How does this work exactly?

same behavior occurs with delegatecall. if i set the 10M to anything above 980422 or remove it, same behavior. but if i set the 10M to anything below 980422, it now regains control of its gas limit.