Every isolation technique is answering the same question of how to reduce or eliminate the untrusted code’s access to that massive attack surface.
BYOB also can't be used with async iteration or TransformStreams, so developers who want zero-copy reads are forced back into the manual reader loop.
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The 386 solves this by repurposing RPT (Repeat). Normally, RPT implements loops -- it re-executes a micro-instruction while decrementing a counter, as we saw in the multiplication post. But when a protection test is in flight, the hardware suppresses RPT's counter-decrement and turns it into a pure stall: the sequencer freezes until the PLA result arrives.