assertion failed when use mp_encode_int

[stdanley]

hello, all I have been using this libray, but failed at encode_int. when I looked into the code, I found: " MP_IMPL char * mp_encode_int(char *data, int64_t num) { assert(num < 0); if (num >= -0x20) {

" what's the reason to force "num <0"

[rtsisyk]

Please use encode_uint for unsigned numbers.

[Totktonada]

The story is in #1.