These aren't contrived scenarios invented by test authors in total vacuum. They're consequences of the spec's design and reflect real world bugs.
if (res === '') res = '0';
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Жители Санкт-Петербурга устроили «крысогон»17:52
The page walker is a simple but effective state machine that handles TLB misses transparently, running in parallel with the microcode and driving its own bus access.
Verify the output.