tee() splits a stream into two branches. It seems straightforward, but the implementation requires buffering: if one branch is read faster than the other, the data must be held somewhere until the slower branch catches up.
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When a host runtime provides a byte-oriented ReadableStream from the runtime itself, for instance, as the body of a fetch Response, it is often far easier for the runtime itself to provide an optimized implementation of BYOB reads, but those still need to be capable of handling both default and BYOB reading patterns and that requirement brings with it a fair amount of complexity.