Currently
someSequence.joined(separator: [])
someSequence.flatten()
(where someSequence is a sequence of sequences) results in two equal sequences
(apart from their exact types). I would like to have flatten() renamed to
joined(), resulting in joined(_:) seemingly having an empty array as the
default parameter.
Similarly, I propose to give joined(_:) for a sequence of strings the empty
string as the default parameter, allowing us to replace something like
["Hello, ", "world!"].joined(separator: "") // "Hello, world!"
with
["Hello, ", "world!"].joined() // "Hello, world!”
In other words, I think joined(_:) should have a default parameter of either
`[]` or `””` and flatten() could then be removed as it would act the exact same
way as joined().
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