test case for custom filetype handler

README.md

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+# filetype handler not working as expected
+
+Following the [docs](https://weborigami.org/language/filetypes#custom-file-types), I have created a file `foobar.foo` and a handler `foo.handler.js`.
+
+```text
+#foobar.fo
+This is the original text
+```
+
+```javascript
+//foo.handler.js
+//I believe this is not being used, because in doctree.js, isUnpackable is false, and toString is not exported by @weborigami/origami anymore ... ?
+import { toString } from "@weborigami/origami";
+
+export default {
+  mediaType: "application/json",
+  unpack: (packed) => { return {what: "a text file"} }
+}
+```
+
+```
+//config.ori
+{
+  hello = "world"
+  foo.handler = ./dj.handler.js
+}
+```
+
+## Expected/Actual results:
+
+When running `ori foobar.foo/`, I would expect to receive an object `{what: "a text file"}` but I receive the original text in `foobar.foo`.
+
+
+

config.ori

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+{
+  hello = "world"
+  foo.handler = ./dj.handler.js
+}
+

foo.handler.js

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+//I believe this is not being used, because in doctree.js, isUnpackable is false, and toString is not exported by @weborigami/origami anymore ... ?
+import { toString } from "@weborigami/origami";
+
+export default {
+  mediaType: "application/json",
+  unpack: (packed) => { return {what: "a text file"} }
+}
+

foobar.foo

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+This is the original text