Description:
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see https://3v4l.org/ko1WZ

false is often an error return type of some previous action and showing explicitly "false" instead of "bool" improves the explanation value of the php output.

Test script:
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<?php declare(strict_types=1);

function x(string $a) {}

x(false);

Expected result:
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Fatal error: Uncaught TypeError: x(): Argument #1 ($a) must be of type string, false given

Actual result:
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Fatal error: Uncaught TypeError: x(): Argument #1 ($a) must be of type string, bool given