Expose way to access the two wrapped ints

[anmolitor]

I'm currently trying to add int64 encoders and decoders to elm-protocol-buffers
and I'm struggling to implement the VarInt encoding.
The int32 version currently converts the number to base 128, right shifts and continues in a loop.

This is the code:

toVarIntEncoders : Int -> List Encode.Encoder
toVarIntEncoders value =
    let
        base128 =
            Bitwise.and 0x7F value

        higherBits =
            Bitwise.shiftRightZfBy 7 value
    in
    if higherBits /= 0x00 then
        Encode.unsignedInt8 (Bitwise.or 0x80 base128) :: toVarIntEncoders higherBits

    else
        [ Encode.unsignedInt8 base128 ]

I cannot do this with Int64, since the inner values are not exposed.
Using Int64.encode instead of Encode.unsignedInt8 has the correct first two bytes but too many zeros afterwards.

[anmolitor]

I used Int64.getByteValues instead, the resulting code feels a bit weird but works.