PriceHistory struct types are different from what is presented by tdameritrade

[dnapier]

PriceHistory delivers volume and datetime as int64, rather than float64 and int respectively.

Volume shouldn't be a float because fractional shares aren't a thing on the exchange. Datetime should be int64 because that is what is used for time.Unix.

[jadefox10200]

Sadly, I'm only seeing this now. Take a look at this pull request:

https://github.com/JonCooperWorks/go-tdameritrade/pull/6