As for the refinements mentioned in JEP454

[Cheng Jin]

Hi there,

I've got a question about JEP454 at  https://openjdk.org/jeps/454 in which some of refinements confused me as follows:


  1.  Enabled clients to build C-language function descriptors programmatically, avoiding platform-specific constants;
  2.  Improved support for variable-length arrays in native memory;
  3.  Added support for arbitrary charsets for native strings.

I didn't find any description in the JEP to clarify how they work and what they mean to users.
Could anybody explain these refinements in more details? Many thanks.

Best Regards
Cheng
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