Settle on .raku / .rakumod / .rakudoc / .rakutest

Author: lizmat

solutions/language/PATH-TO-RAKU.md

@@ -142,16 +142,18 @@ be symlinks.  If at all technically possible, running a script using the
 
 ### Extensions
 
-The matter of file extensions will be decided as a separate issue / PR.
-
-Suggestions for that issue: the extension `.rk` for scripts, `.rkm` for
-modules, and `.rd` for documentation (POD6) to become the defacto standards
-for files containing `Raku` code or documentation.  The old `.pm`, `.pm6` and
-`.pod6` extensions will continue to be supported for 6.e.  In 6.f, the `.pm`,
-`.pm6` and `.pod6` extensions could be marked as DEPRECATED, causing a message
-to be generated when the module is loaded.
-
-On Windows, installers should add a `.rk` association alongside the `.p6`
+The extension `.raku` for scripts, `.rakumod` for modules, and `.rakudoc`
+for documentation (POD6) to become the defacto standards for files containing
+`Raku` code or documentation.  The old `.pm`, `.pm6` and `.pod6` extensions
+will continue to be supported for 6.e.  In 6.f, the `.pm`, `.pm6` and `.pod6`
+extensions could be marked as DEPRECATED, causing a message to be generated
+when the module is loaded.
+
+For testing, the extension `.rakutest` should be used, while the old `.t`
+extension will continue to be supported for 6.e, with deprecation messages
+appearing drom 6.f onward.
+
+On Windows, installers should add a `.raku` association alongside the `.p6`
 association for the time being. Around the time of 6.f, a `.p6` association
 could be deselected by default, and perhaps dropped entirely by 6.g.