Update 1.21-notes.md

doc/1.21-notes.md

@@ -63,6 +63,7 @@
 * Make more registries dynamic/datapackable, e.g. brews
 * Make verified multiblocks (alfheim portal frame, terra plate base, enchanter setup, gaia arena without beacon base) datapackable, but with plausability checks
 * Set up `package-info.java` with `@FieldsAreNonnullByDefault`, `@MethodsReturnNonnullByDefault`, and `@ParametersAreNonnullByDefault` (as Minecraft, Fabric API, and NeoForge do) to cut down the number of required `@NonNull` annotations everywhere
+* Change `Bound.UNBOUND_POS` and `ManaBurst.NO_SOURCE` to be proper `Optional`s instead of having a `(0, MIN_INT, 0)` position.
 
 ### Feature candidates (potentially breaking changes)
 * nice-to-have Patchouli features we could use, that are yet to be merged:
@@ -134,4 +135,4 @@
 * (This would be a big change with lots of consequences; Requires thorough discussion and testing) Consider tweaking the requirements for spreaders firing. For example, completely ignore fired bursts and fire at a fixed interval. Or maybe allow three bursts in flight at the same time.
 
 ### Development period
-I think for 1.21 i want to have a somewhat long beta period while we get everything in order and do all the breaking changes we want to do (as you can see there are a lot planned). Also to get community feedback on the more invasive changes.
+I think for 1.21 i want to have a somewhat long beta period while we get everything in order and do all the breaking changes we want to do (as you can see there are a lot planned). Also to get community feedback on the more invasive changes.