Proposal Document

• Proposal added
• Discussed in LDM
• Decision in LDM
• Finalized (done, rejected, inactive)
• Spec'ed

This is issue is related to the following:

• Champion "params Span<T>" #1757
• Champion "Permit IEnumerable<T> as the type of a params parameter" #179
• Protoype for nonallocating string formatting corefxlab#2595

LDM history:

• https://github.com/dotnet/csharplang/blob/master/meetings/2019/LDM-2019-03-04.md#params-and-string-interpolation
• https://github.com/dotnet/csharplang/blob/main/meetings/2022/LDM-2022-09-26.md#ungrouped