[ruby-core:116152] [Ruby master Feature#20176] Array#pack: support offset kwarg

Issue #20176 has been reported by chucke (Tiago Cardoso).

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Feature #20176: Array#pack: support offset kwarg
https://bugs.ruby-lang.org/issues/20176

* Author: chucke (Tiago Cardoso)
* Status: Open
* Priority: Normal
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I was changing some code to use ruby 3.3's new `buffer` kwarg (great addition btw!) when using `Array#pack`. There are a few cases however, where I could perform the change, as not all my usages rely on appending; in some, I'm actually prepending it.

To solve this, I'd like to propose the `offset` kwarg, which declares where to add the resulting string. picking up on example from the docs:

    [65, 66].pack('C*', buffer: 'foo') # => "fooAB"
    [65, 66].pack('C*', buffer: 'foo', offset: 0) # => "ABfoo"
    [65, 66].pack('C*', buffer: 'foo', offset: 1) # => "fABoo"
    



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