C/C++
C/C++ Features Updates: CPP Reference
C#
C# Feature Proposal: csharplang
C# New Features: What's new in CSharp
C# Official Blog: DevBlogs
ECMAScript
ES Proposals: tc39/proposal
ES Implementations: proposals.es
F-Sharp(F#)
Comment by: https://dev.to/edelsora
F# Feature Proposal: fsharp
F# Official Blog: DevBlogs
Java 🍵
JEP (Java Enhancement Proposal): Java JEP
Java Version "X" Features: JDK Projects
JVM and JEP "X" Comparisons: Chris Who Code
Java Weekly Reading: Baeldung Weekly Review
PHP
PHP Request For Comments: PHP-RFC
PHP RFC Implemented: RFC-IMPL
... more to come
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F#
F# Feature Proposal : fsharp
F# Official Blog: DevBlogs