chore: add changeset

.changeset/lovely-carrots-train.md

@@ -0,0 +1,11 @@
+---
+"typed-openapi": minor
+---
+
+Thanks to @0237h:
+
+Allow for finer marking of optional parameters Current behavior allows only for marking _all_ parameters as optional, or
+none.
+
+This change checks first if all parameters are optional, keeping the old behavior if that's the case, otherwise iterates
+through the parameters to mark only those that **should** be optional from the OpenAPI spec.