Issue #12754 has been updated by Nobuyoshi Nakada.

Tracker changed from Bug to Feature

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Feature #12754: Want to use prepared buffer with `Array#pack`
https://bugs.ruby-lang.org/issues/12754#change-61074

* Author: Usaku NAKAMURA
* Status: Open
* Priority: Normal
* Assignee: 
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`Array#pack` always returns new allocated `String`, but sometimes users want to use prepared buffer, especially the packed size is too large.
I often uses `Fiddle` to call OS APIs, and encounter this problem as every time.
I recommend to add keyword arguments for the purpose.

```ruby
buf = '\0'*(32 * 1024 * 1024)
# ...
ary.pack(LONG_FORMAT, buffer: buf, offset: 4 * 1024) # returns `buf`
```




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