pkgset: breaking, make default behavior :root #49
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This change:
When using the expression syntax, the first usage is often to target
all the roots and the dependenices... however most reduction need to use
:root. Effectively making the expressions longer than they need to be.
For a comparison:
X - golang.org/x/tools/...:root - github.com/xyz/...:root
After this change:
X:all - golang.org/x/tools/... - github.com/xyz/...
Arguably, the second one is easier to read and understand.
CC @rogpeppe