Nate Cook e2328885c1 [stdlib] Dictionary/Set enhancements ...

A variety of enhancements from SE-154 and SE-165:

- Custom Keys and Values collections for Dictionary
- Two sequence-based Dictionary initializers
- Merging methods for Dictionary
- Capacity checking and reserving for Dictionary and Set
- Type-specific filter(_:) methods for Dictionary and Set
- A mapValues(_:) method for Dictionary
- A grouping Dictionary initializer

2017-04-26 11:21:16 -05:00

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