[Swift-devel] new coaster code

[Ben Clifford]

Gratuituous behaviour changing is to be avoided. However coasters are not 
at the point in stability where lack-of-behaviour-change is desirable in 
preference to significant-enhancement-in-functionality.
 
You should at least go through the userguide and delete any 
coaster-related text that no longer applies, so that it contains nothing 
in preference to mistruth.

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