Tamir Duberstein 59b6f01712 Replace buffer with bufferedReader ...

bufferedReader is an optimized implementation of io.Reader that behaves
like
```
io.MultiReader(bytes.NewReader(buffer.Bytes()), io.TeeReader(source, buffer))
```
without allocating.

This has a measurable effect on benchmarks:
```
name        old time/op    new time/op    delta
CMuxConn-4    1.09µs ± 4%    0.99µs ±19%   -9.32%  (p=0.000 n=17+19)

name        old alloc/op   new alloc/op   delta
CMuxConn-4      240B ± 0%      260B ± 0%   +8.33%  (p=0.000 n=20+20)

name        old allocs/op  new allocs/op  delta
CMuxConn-4      9.00 ± 0%      5.00 ± 0%  -44.44%  (p=0.000 n=20+20)
```

Note that appropriate test coverage is provided by `TestRead`.

2016-02-28 19:41:37 -05:00

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