slack: json: cannot unmarshal string into Go value of type int64

@saxsir yep, looks like json.Number will cover both cases: https://play.golang.org/p/75NwTQT-MG

@saxsir his solution fixes it for me too

I’m having same problem. (getting json: cannot unmarshal number into Go value of type string)

How is use json.Number instead of string ? https://golang.org/pkg/encoding/json/#Number

Type json.Number is an alias for string.

http://stackoverflow.com/questions/24480835/go-decoding-json-int-into-string

Slack discussion about ts field: https://github.com/slackhq/slack-api-docs/issues/7#issuecomment-67913241