Should confirm x5c is actually an array

[ghost]

using v1.6.0

Testing against a (broken) provider that only returns a single cert in x5c as a string.

https://github.com/auth0/node-jwks-rsa/blob/master/src/JwksClient.js#L71 will succeed, because a string passes those checks.

The code should additionally check that key.x5c is an array.

[stale]

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[ghost]

This is still a bug IMO