readInt

pub fn readInt(fbr: *FixedBufferReader, comptime T: type) Error!T {
    const size = @divExact(@typeInfo(T).int.bits, 8);
    if (fbr.buf.len - fbr.pos < size) return error.EndOfBuffer;
    defer fbr.pos += size;
    return std.mem.readInt(T, fbr.buf[fbr.pos..][0..size], fbr.endian);
}