pub fn put_varint(buf: &mut BytesMut, value: u64)Expand description
Appends value as a QUIC varint.
ยงPanics
If value exceeds VARINT_MAX, which is unrepresentable.
Each arm narrows to the width varint_len has just proved the value fits:
one byte only below 0x40, two only below 0x4000, four only below
0x4000_0000.