cmd/cue: update which experiments are on by default

We again forgot to update `cue help environment` when
the embed and toposort experiments were turned on by default in v0.12.0.
https://cuelang.org/issue/3848 tracks automating this help text.

While here, add a TODO to remember to finish the toposort experiment
for v0.14, just like the TODO we already have for the embed experiment.

Signed-off-by: Daniel Martí <[email protected]>
Change-Id: I19516d3a50f320107be1be5113ae382f67bbefba
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/1214816
Unity-Result: CUE porcuepine <[email protected]>
TryBot-Result: CUEcueckoo <[email protected]>
Reviewed-by: Matthew Sackman <[email protected]>

Author: mvdan

cmd/cue/cmd/help.go

@@ -300,10 +300,10 @@ If an environment variable is unset or empty, sensible default setting is used.
 		evalv3 (default true)
 			Enable the new CUE evaluator, addressing performance issues
 			and bringing a better disjunction algorithm.
-		embed
+		embed (default true)
 			Enable support for embedded data files as described in
 			https://cuelang.org/discussion/3264.
-		toposort
+		toposort (default true)
 			Enable topological sorting of struct fields.
 			Provide feedback via https://cuelang.org/issue/3558
 

internal/cueexperiment/exp.go

@@ -20,6 +20,7 @@ var Flags struct {
 	Embed bool `envflag:"default:true"`
 
 	// Enable topological sorting of struct fields.
+	// TODO(v0.14): deprecate this flag to forbid disabling this feature.
 	TopoSort bool `envflag:"default:true"`
 
 	// The flags below describe completed experiments; they can still be set
@@ -33,8 +34,7 @@ var Flags struct {
 	// YAMLV3Decoder was an experiment which ran from early 2024 to late 2024.
 	YAMLV3Decoder bool `envflag:"deprecated,default:true"`
 
-	// DecodeInt64 was an experiment which ran from late 2024
-	// to mid 2025.
+	// DecodeInt64 was an experiment which ran from late 2024 to mid 2025.
 	DecodeInt64 bool `envflag:"deprecated,default:true"`
 }