Select doesn't accept an array value

[tchandelle]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

Should be able to set an array as the value of a select

What are the steps to reproduce?

https://plnkr.co/edit/lnj292JDLrd2SS0cPzNo?p=preview
In select-overview-example.ts, see lines 19 and 20.
When the preselected value is an array, it doesn't work.

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

Since, at-least, beta.8. Still in beta.12
Angular 4.4.4

[willshowell]

Please see compareWith. By default MatSelect compares values by Object reference.

[tchandelle]

That's not the problem. I pass the same array with the same reference.
Looking at the sources, I think the problem is on select.ts:722. It should check this.multiple instead of isArray

[willshowell]

Ah my bad! There have been lots of questions like that lately, so I didn't fully look it over.

cc @crisbeto

[crisbeto]

The assumption has always been that if you're providing an array value, you're probably in multiple mode, but I see how it's an issue.

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