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`Array#[]` indexed the Vec directly and panicked for out-of-range and negative-out-of-range indices; it now returns nil (as in CRuby) and rejects a missing index. `Array.new` ignored a block and only filled with nil; it now supports `Array.new(size) { |i| ... }` and `Array.new(size, default)`. Adds tests.
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Array#[]indexed the Vec directly and panicked for out-of-range and negative-out-of-range indices; it now returns nil and rejects a missing index.Array.newignored a block and only filled with nil; it now supportsArray.new(size) { |i| ... }andArray.new(size, default). Adds tests.