Examples using... bytes.Buffer.Grow()
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Len returns the number of bytes of the unread portion of the buffer;
b.Len() == len(b.Bytes()).
Grow grows the buffer's capacity, if necessary, to guarantee space for
another n bytes. After Grow(n), at least n bytes can be written to the
buffer without another allocation.
If n is negative, Grow will panic.
If the buffer can't grow it will panic with ErrTooLarge.