[ruby-core:111434] [Ruby master Feature#19261] `Data#members` is not important

Issue #19261 has been reported by ko1 (Koichi Sasada).

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Feature #19261: `Data#members` is not important
https://bugs.ruby-lang.org/issues/19261

* Author: ko1 (Koichi Sasada)
* Status: Open
* Priority: Normal
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`Data#members` is defined but it is calculated by `self.class.members` (in other words, `#members` is a shorthand for `self.class.members`).
So it is better to remove this method.

```ruby
P = Data.define(:x, :y)
p P.new(1, 2).members #=> [:x, :y]

Group = Data.define(:name, :members)
gs = Group.new('SasadaFamily', %w(ko1 yuki))
p gs.members #=> ["ko1", "yuki"]
```




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