spec: make slice when capacity is unspecified

[btracey]

Currently if the capacity of a slice is unspecified during a make call, the slice is
created with the capacity equal to the length. As far as I can tell, the spec does not
specify this behavior. Can this behavior be counted on, or if I want to ensure the slice
does not use up extra memory do I need to call 
s := make([]T, len, len) ?

A clarification in the spec either way would be nice.

[minux]

Comment 1:

See http://golang.org/ref/spec#Making_slices_maps_and_channels:
Call             Type T     Result
make(T, n)       slice      slice of type T with length n and capacity n
make(T, n, m)    slice      slice of type T with length n and capacity m
make(T)          map        map of type T
make(T, n)       map        map of type T with initial space for n elements
make(T)          channel    synchronous channel of type T
make(T, n)       channel    asynchronous channel of type T, buffer size n

Status changed to WorkingAsIntended.