fix: improve concurrency and fix various issues (#464)

.changeset/avoid-double-set.md

@@ -0,0 +1,12 @@
+---
+"@empirica/core": patch
+---
+
+Avoid re-setting a key to the same value from the client side. For example:
+
+```js
+scope.set("key", "value");
+scope.set("key", "value"); // no-op
+```
+
+This is not only for sets in the same tick as shown here, but also across ticks.

.changeset/improve-concurrency.md

@@ -0,0 +1,5 @@
+---
+"@empirica/core": patch
+---
+
+Improve various concurrency issues.

.changeset/set-introdone-once.md

@@ -0,0 +1,5 @@
+---
+"@empirica/core": patch
+---
+
+When <Steps> has no steps, only set the doneKey once.

.gitignore

@@ -16,4 +16,5 @@ e2e-tests/test-experiment-*
 e2e-tests/cache
 
 out
+.vscode
 NOTES

cmds/empirica/main.go

@@ -5,5 +5,7 @@ import (
 )
 
 func main() {
+	// defer profile.Start(profile.ClockProfile, profile.NoShutdownHook).Stop()
+
 	cmd.Execute()
 }