FAQ
to answer your earlier question: no there is no //-inline or #pragma inline or any user control over inlining. one '-l' lets you /disable/ inlining, repeating it more often is deliberately undocumented in the help text, and explicitly warned against in the code.

The reason transitive inlining isn't there is because runtime.Caller's current implementation could not handle that. I have no idea where it is on the agenda.

to come back to your overall point: your peek is about as fast as it is going to be, but if your program spends 30% of its time in there, maybe you can expose the current unread size, and read up to that into a buffer. E.g. bufio.Reader allows exactly that with .Buffered(), and it's Peek() looks a lot like yours.

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