stripe / stripe-ruby / 3481

96%

master: 97%

Pull #861

travis-ci

Nicer error when specifying non-nil non-string opt value

Previously, if you specified a non-nil non-string opt value, like a
symbol for `idempotency_key`, you'd get a pretty user-unfriendly error
from `Net::HTTP`:

```
/Users/brandur/.rbenv/versions/2.4.5/lib/ruby/2.4.0/net/http/header.rb:21:in `block in initialize_http_header': undefined method `strip' for :foo:Symbol (NoMethodError)
```

Here, we introduce a new argument error that makes it a little easier
for someone to read. The impetus for the change is that we had an
internal product quality report where someone ran into this and was
confused.

I'm pretty sure this change is backward compatible because `Net::HTTP`
would call `strip` on anything that was passed in as a value, and
generally just strings would support that. There may be some other less
common data type that was accidentally compatible that someone was
using, but that case should be quite unusual.

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