They are almost the same: they share the same underlying array. You do get a copy of the little (ptr, len, capacity) struct which is what a slice is.
'Disgrace'
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Web streams use a locking model to prevent multiple consumers from interleaving reads. When you call getReader(), the stream becomes locked. While locked, nothing else can read from the stream directly, pipe it, or even cancel it — only the code that is actually holding the reader can.