[#329] Client: support numbers in multipart messages, and throw on unkown multipart params types (@dmichulke)
[#329] Client: support numbers in multipart messages, and throw on unkown multipart params types (@dmichulke)

ptaoussanis/http-kit,http-kit/http-kit,ptaoussanis/http-kit,http-kit/http-kit,http-kit/http-kit,ptaoussanis/http-kit,ptaoussanis/http-kit,ptaoussanis/http-kit,http-kit/http-kit,http-kit/http-kit,ptaoussanis/http-kit,http-kit/http-kit