Firebase Authenticated User created without email address - Google from IOS - ios

Question

I have set up firebase authentication and am trying to send a welcome email
What I do not understand is why the authenticated user does not have an email field and only has this in the provider data. All the samples use something similar to:
exports.sendWelcomeEmail = functions.auth.user().onCreate(event => {
const user = event.data; // The Firebase user.
const email = user.email; // The email of the user.
const displayName = user.displayName; // The display name of the user.
console.log("New User created: " + JSON.stringify(user));
console.log('email:', email);
However, my authenticated user does not seem to me to have an email
My log shows
email: undefined
I am using google authentication from IOS with GIDSignInButton
My console log has the following
{
"displayName": "Ryan H",
"metadata": {
"createdAt": "2017-06-19T10:06:21.000Z",
"lastSignedInAt": "2017-06-19T10:06:21.000Z"
},
"photoURL": "https://lh6.googleusercontent.com/-MXne-lIR8e8/AAAAAAAAAAI/AAAAAAAAbeQ/Z1OvxasY/s96-c/photo.jpg",
"providerData": [
{
"displayName": "Ryan H",
"email": "ryanh#gmail.com",
"photoURL": "https://lh6.googleusercontent.com/-MXne-lIR8e8/AAAAAAAAAAI/AAAAAAAAbeQ/Z1asY/s96-c/photo.jpg",
"providerId": "google.com",
"uid": "1077081708"
}
],
"uid": "WjdlLc3QNvrmkj0yOuqo2"
}
As you can see there is no email except in the provider data.
Has there been a change in the model?
Should I always try to get my email address from the provider data?
Why are all the same code and examples I find using user.email ?
I currently have google and facebook enabled as "sign in methods".
Perhaps if I also enabled email/password I would have access.
I can confirm that in my IOS app the User after sign in does not have email either.
According to https://firebase.google.com/docs/auth/users
The first time a user signs up to your app, the user's profile data is populated using the available information:
If the user signed up with an email address and password, only the primary email address property is populated
If the user signed up with a federated identity provider, such as Google or Facebook, the account information made available by the provider is used to populate the Firebase User's profile

Answer 1

This is a workaround to my issue not really an answer:
I extract an email from the first provider I find, which in my case is always
Google
exports.sendWelcomeEmail = functions.auth.user().onCreate(event => {
const user = event.data; // The Firebase user.
var email = user.email; // The email of the user.
if (email == undefined) {
for (var provider of user.providerData) {
if (provider.email) {
email = provider.email;
break;
}
}
}
const displayName = user.displayName; // The display name of the user.
// [END eventAttributes]
console.log("New User created: " + JSON.stringify(user));
console.log('email:', email);
console.log('displayName:', displayName);
sendWelcomeEmail(email,displayName)
return;
});`