[Rg 78] darcs patch: make snippets/struct/values_at behaviour... (and 2 more)

[rff.rff at gmail.com]

The two specs shoulkd be merged easily because they don't change behaviour.

The first patch, though, changes Struct#values_at slightly so that it should be 
backwards compatible with the standard Struct#values_at behaviour. I can't see problems with this, and all tests still pass.
Ah, it also removes a method call, thus it should be marginally faster (as in: 1 microsecond less per year)

Wed Sep  5 11:32:13 CEST 2007  rff.rff at gmail.com
  * make snippets/struct/values_at behaviour compatible with standard ruby

Wed Sep  5 11:34:39 CEST 2007  rff.rff at gmail.com
  * spec for Struct#fill

Wed Sep  5 11:36:22 CEST 2007  rff.rff at gmail.com
  * spec for Struct#values_at


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