fix: JSII_RUNTIME_PACKAGE_CACHE improper case bug (#3912)

Fix bug where cached enabled is always false.
fixes #3911

It took me a good 4 minutes to figure out that the PR title needs a to be prefixed with `fix:` including the colon 😄 

---

By submitting this pull request, I confirm that my contribution is made under the terms of the [Apache 2.0 license].

[Apache 2.0 license]: https://www.apache.org/licenses/LICENSE-2.0

.all-contributorsrc

@@ -1522,6 +1522,15 @@
       "contributions": [
         "bug"
       ]
+    },
+    {
+      "login": "Ragnoroct",
+      "name": "Will Bender",
+      "avatar_url": "https://avatars.githubusercontent.com/u/19155205?v=4",
+      "profile": "https://github.com/Ragnoroct",
+      "contributions": [
+        "bug"
+      ]
     }
   ],
   "repoType": "github",

README.md

@@ -228,32 +228,33 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
     </tr>
     <tr>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/Lanayx"><img src="https://avatars2.githubusercontent.com/u/3329606?v=4?s=100" width="100px;" alt="Vladimir Shchur"/><br /><sub><b>Vladimir Shchur</b></sub></a><br /><a href="https://github.com/aws/jsii/issues?q=author%3ALanayx+label%3Abug" title="Bug reports">🐛</a></td>
+      <td align="center" valign="top" width="14.28%"><a href="https://github.com/Ragnoroct"><img src="https://avatars.githubusercontent.com/u/19155205?v=4?s=100" width="100px;" alt="Will Bender"/><br /><sub><b>Will Bender</b></sub></a><br /><a href="https://github.com/aws/jsii/issues?q=author%3ARagnoroct+label%3Abug" title="Bug reports">🐛</a></td>
       <td align="center" valign="top" width="14.28%"><a href="http://yanex.org/"><img src="https://avatars2.githubusercontent.com/u/95996?v=4?s=100" width="100px;" alt="Yan Zhulanow"/><br /><sub><b>Yan Zhulanow</b></sub></a><br /><a href="https://github.com/aws/jsii/commits?author=yanex" title="Code">💻</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/yglcode"><img src="https://avatars.githubusercontent.com/u/11893614?v=4?s=100" width="100px;" alt="Yigong Liu"/><br /><sub><b>Yigong Liu</b></sub></a><br /><a href="https://github.com/aws/jsii/issues?q=author%3Ayglcode+label%3Abug" title="Bug reports">🐛</a> <a href="https://github.com/aws/jsii/issues?q=author%3Ayglcode+label%3Afeature-request" title="Feature requests">🤔</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/ZachBien"><img src="https://avatars.githubusercontent.com/u/1245628?v=4?s=100" width="100px;" alt="Zach Bienenfeld"/><br /><sub><b>Zach Bienenfeld</b></sub></a><br /><a href="https://github.com/aws/jsii/issues?q=author%3AZachBien+label%3Abug" title="Bug reports">🐛</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/ajnarang"><img src="https://avatars3.githubusercontent.com/u/52025281?v=4?s=100" width="100px;" alt="ajnarang"/><br /><sub><b>ajnarang</b></sub></a><br /><a href="https://github.com/aws/jsii/issues?q=author%3Aajnarang+label%3Afeature-request" title="Feature requests">🤔</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/aniljava"><img src="https://avatars.githubusercontent.com/u/412569?v=4?s=100" width="100px;" alt="aniljava"/><br /><sub><b>aniljava</b></sub></a><br /><a href="https://github.com/aws/jsii/commits?author=aniljava" title="Code">💻</a></td>
-      <td align="center" valign="top" width="14.28%"><a href="https://github.com/arnogeurts-sqills"><img src="https://avatars.githubusercontent.com/u/79304871?v=4?s=100" width="100px;" alt="arnogeurts-sqills"/><br /><sub><b>arnogeurts-sqills</b></sub></a><br /><a href="https://github.com/aws/jsii/issues?q=author%3Aarnogeurts-sqills+label%3Abug" title="Bug reports">🐛</a> <a href="https://github.com/aws/jsii/commits?author=arnogeurts-sqills" title="Code">💻</a></td>
     </tr>
     <tr>
+      <td align="center" valign="top" width="14.28%"><a href="https://github.com/arnogeurts-sqills"><img src="https://avatars.githubusercontent.com/u/79304871?v=4?s=100" width="100px;" alt="arnogeurts-sqills"/><br /><sub><b>arnogeurts-sqills</b></sub></a><br /><a href="https://github.com/aws/jsii/issues?q=author%3Aarnogeurts-sqills+label%3Abug" title="Bug reports">🐛</a> <a href="https://github.com/aws/jsii/commits?author=arnogeurts-sqills" title="Code">💻</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/cn-cit"><img src="https://avatars.githubusercontent.com/u/27255477?v=4?s=100" width="100px;" alt="cn-cit"/><br /><sub><b>cn-cit</b></sub></a><br /><a href="https://github.com/aws/jsii/issues?q=author%3Acn-cit+label%3Abug" title="Bug reports">🐛</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/deccy-mcc"><img src="https://avatars0.githubusercontent.com/u/45844893?v=4?s=100" width="100px;" alt="deccy-mcc"/><br /><sub><b>deccy-mcc</b></sub></a><br /><a href="https://github.com/aws/jsii/issues?q=author%3Adeccy-mcc+label%3Abug" title="Bug reports">🐛</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/apps/dependabot-preview"><img src="https://avatars3.githubusercontent.com/in/2141?v=4?s=100" width="100px;" alt="dependabot-preview[bot]"/><br /><sub><b>dependabot-preview[bot]</b></sub></a><br /><a href="https://github.com/aws/jsii/issues?q=author%3Adependabot-preview[bot]+label%3Abug" title="Bug reports">🐛</a> <a href="https://github.com/aws/jsii/pulls?q=is%3Apr+author%3Adependabot-preview[bot]" title="Maintenance">🚧</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/apps/dependabot"><img src="https://avatars0.githubusercontent.com/in/29110?v=4?s=100" width="100px;" alt="dependabot[bot]"/><br /><sub><b>dependabot[bot]</b></sub></a><br /><a href="https://github.com/aws/jsii/pulls?q=is%3Apr+author%3Adependabot[bot]" title="Maintenance">🚧</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/dheffx"><img src="https://avatars0.githubusercontent.com/u/22029918?v=4?s=100" width="100px;" alt="dheffx"/><br /><sub><b>dheffx</b></sub></a><br /><a href="https://github.com/aws/jsii/issues?q=author%3Adheffx+label%3Abug" title="Bug reports">🐛</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/gregswdl"><img src="https://avatars0.githubusercontent.com/u/47365273?v=4?s=100" width="100px;" alt="gregswdl"/><br /><sub><b>gregswdl</b></sub></a><br /><a href="https://github.com/aws/jsii/issues?q=author%3Agregswdl+label%3Abug" title="Bug reports">🐛</a></td>
-      <td align="center" valign="top" width="14.28%"><a href="https://github.com/guyroberts21"><img src="https://avatars.githubusercontent.com/u/47118902?v=4?s=100" width="100px;" alt="guyroberts21"/><br /><sub><b>guyroberts21</b></sub></a><br /><a href="https://github.com/aws/jsii/commits?author=guyroberts21" title="Documentation">📖</a></td>
     </tr>
     <tr>
+      <td align="center" valign="top" width="14.28%"><a href="https://github.com/guyroberts21"><img src="https://avatars.githubusercontent.com/u/47118902?v=4?s=100" width="100px;" alt="guyroberts21"/><br /><sub><b>guyroberts21</b></sub></a><br /><a href="https://github.com/aws/jsii/commits?author=guyroberts21" title="Documentation">📖</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/mattBrzezinski"><img src="https://avatars.githubusercontent.com/u/4356074?v=4?s=100" width="100px;" alt="mattBrzezinski"/><br /><sub><b>mattBrzezinski</b></sub></a><br /><a href="https://github.com/aws/jsii/commits?author=mattBrzezinski" title="Documentation">📖</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/mergify"><img src="https://avatars.githubusercontent.com/u/18240476?v=4?s=100" width="100px;" alt="mergify"/><br /><sub><b>mergify</b></sub></a><br /><a href="https://github.com/aws/jsii/pulls?q=is%3Apr+author%3Amergify" title="Maintenance">🚧</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/apps/mergify"><img src="https://avatars1.githubusercontent.com/in/10562?v=4?s=100" width="100px;" alt="mergify[bot]"/><br /><sub><b>mergify[bot]</b></sub></a><br /><a href="https://github.com/aws/jsii/pulls?q=is%3Apr+author%3Amergify[bot]" title="Maintenance">🚧</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/nathannaveen"><img src="https://avatars.githubusercontent.com/u/42319948?v=4?s=100" width="100px;" alt="nathannaveen"/><br /><sub><b>nathannaveen</b></sub></a><br /><a href="https://github.com/aws/jsii/pulls?q=is%3Apr+author%3Anathannaveen" title="Maintenance">🚧</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/seiyashima"><img src="https://avatars2.githubusercontent.com/u/4947101?v=4?s=100" width="100px;" alt="seiyashima42"/><br /><sub><b>seiyashima42</b></sub></a><br /><a href="https://github.com/aws/jsii/issues?q=author%3Aseiyashima+label%3Abug" title="Bug reports">🐛</a> <a href="https://github.com/aws/jsii/commits?author=seiyashima" title="Code">💻</a> <a href="https://github.com/aws/jsii/commits?author=seiyashima" title="Documentation">📖</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/sullis"><img src="https://avatars3.githubusercontent.com/u/30938?v=4?s=100" width="100px;" alt="sullis"/><br /><sub><b>sullis</b></sub></a><br /><a href="https://github.com/aws/jsii/commits?author=sullis" title="Code">💻</a></td>
-      <td align="center" valign="top" width="14.28%"><a href="https://github.com/vaneek"><img src="https://avatars1.githubusercontent.com/u/8113305?v=4?s=100" width="100px;" alt="vaneek"/><br /><sub><b>vaneek</b></sub></a><br /><a href="https://github.com/aws/jsii/issues?q=author%3Avaneek+label%3Abug" title="Bug reports">🐛</a></td>
     </tr>
     <tr>
+      <td align="center" valign="top" width="14.28%"><a href="https://github.com/vaneek"><img src="https://avatars1.githubusercontent.com/u/8113305?v=4?s=100" width="100px;" alt="vaneek"/><br /><sub><b>vaneek</b></sub></a><br /><a href="https://github.com/aws/jsii/issues?q=author%3Avaneek+label%3Abug" title="Bug reports">🐛</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/wendysophie"><img src="https://avatars.githubusercontent.com/u/54415551?v=4?s=100" width="100px;" alt="wendysophie"/><br /><sub><b>wendysophie</b></sub></a><br /><a href="https://github.com/aws/jsii/issues?q=author%3Awendysophie+label%3Abug" title="Bug reports">🐛</a></td>
     </tr>
   </tbody>

packages/@jsii/kernel/src/tar-cache/index.ts

@@ -24,7 +24,7 @@ export interface ExtractResult {
 }
 
 let packageCacheEnabled =
-  process.env.JSII_RUNTIME_PACKAGE_CACHE?.toLocaleUpperCase() === 'enabled';
+  process.env.JSII_RUNTIME_PACKAGE_CACHE?.toLocaleLowerCase() === 'enabled';
 
 /**
  * Extracts the content of a tarball, possibly caching it on disk.