Replace any in favour of some to align with regular JS

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+- Start Date: 2017-06-29
+- RFC PR: (leave this empty)
+- Ember Issue: (leave this empty)
+
+# Summary
+
+Deprecate `Enumerable#any` and introduce `Enumerable#some`.
+
+# Motivation
+
+[`any`](https://emberjs.com/api/classes/Ember.Array.html#method_any) has been
+implemented on `Ember.Enumerable` for years, however native javascript arrays have
+`Array.prototype.some` to perform the same task.
+
+This RFC proposes the addition of `Ember.Enumerable#some`, the aliasing of the old `Ember.Enumerable#any` to it,
+and encourage the usage of the first either in the docs or with deprecation to be as aligned as possible
+with native JavaScript arrays.
+
+# Detailed design
+
+The first step is to rename `any` to `some` and recreate `any` as simply an alias
+of the new method.
+
+The second and optional step is to encourage, possibly with a deprecation, the usage of `some`
+over `any`.
+
+`Ember.Enumerable` is a mixin part of `Ember.NativeArray`, which is applied to `Array.prototype`
+if the user doesn't disable prototype extensions. We do not want to replace the native `Array.prototype.some`
+with ours, possibly slower, JavaScript version so it has to be implemented on a way that respects the native
+implementation.
+
+# How We Teach This
+
+The documentation of [`any`](https://emberjs.com/api/classes/Ember.Array.html#method_any) already
+states that it is equivalent to `Array.prototype.some`. The deprecation and the entries on the guide
+should make it easier, since the semantics of the new function are identical.
+
+There has been [a similar RFC to deprecate `contains` in favour of `includes`](https://github.com/emberjs/rfcs/pull/136)
+in the past and it wasn't a deprecation that caused much rejection from the community.
+
+# Drawbacks
+
+Adding the new function is pretty harmless. It only extends the public API surface a little bit, but arguably
+the second part of the RFC, deprecate `any` in favour of `some` will surely add a certain amount
+of churn for developers.
+
+# Alternatives
+
+Do not add the feature or, in case the feature is seen as positive but the churn is considered too harmful,
+do not deprecate `any`.
+
+# Unresolved questions
+
+There is also a close cousin on `any`, and that is the `isAny(key, value)` convenience function. While
+this function does not clash with any native function, it could be a good idea to rename it to `isSome`
+for consistency.