Start experimenting in a new folder

src/temporal-experimenting/README.md

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+> [!INFO]  
+>
+> Work in progress document. Very drafty.
+
+This folder will contain the implementation of `datetime-attribute` where functions will accept [`Temporal`](https://tc39.es/proposal-temporal/docs) objects while keeping current parameters.
+
+It’s possible that some functions will not require to accept a `Temporal` object because what they accomplish is maybe already available as a `Temporal.{className}` feature.
+
+It’s also possible that new functions are created to facilitate the usage of `Temporal` objects, and the extended scope they cover in comparison with `Date`.
+
+## Parity between `Date` and `Temporal` implementations
+
+**Drafty.**
+
+function | in `Date` | in `Temporal` | note
+---|---|---|---
+`tzOffset` | yes | yes | @todo accept a `Temporal.TimeZone` (or any temporal) and output its “real-world” timezone.
+`datetime` | yes | yes | @todo evaluate
+`utc` | yes | yes | @todo evaluate
+`datetimeTz` | yes | yes | @todo evaluate
+`DateTime` | yes | yes | @todo evaluate
+`duration` | yes | yes | @todo evaluate
+`daysBetween` | yes | yes | @todo evaluate
+`weekNumber` | yes | yes | @todo evaluate
+(config feature…)| yes | yes | @todo evaluate
+
+## `tzOffset` notes
+
+```js
+const tz = new Temporal.TimeZone('-23:59')
+console.log(tz.id) // -23:59
+```