fix: type in SchemaObject can be an array

Fixes #2.

Author: not-my-profile

src/schema.ts

@@ -93,6 +93,18 @@ type UnknownSchema = {
   type?: undefined,
 };
 
+type UnionSchema = {
+  type: ("object" | "string" | "number" | "integer" | "array" | "null" | "boolean")[],
+} & (
+  Partial<Omit<ObjectSchema, "type">>
+  & Partial<Omit<StringSchema, "type">>
+  & Partial<Omit<NumberSchema, "type">>
+  & Partial<Omit<IntegerSchema, "type">>
+  & Partial<Omit<ArraySchema, "type">>
+  & Partial<Omit<NullSchema, "type">>
+  & Partial<Omit<BooleanSchema, "type">>
+)
+
 /**
  * The Schema Object allows the definition of input and output data types. These types can be objects, but also primitives and arrays. This object is a superset of the JSON Schema Specification Draft 2020-12.
  */
@@ -103,5 +115,6 @@ export type SchemaObject = Schema & (
   IntegerSchema |
   ArraySchema |
   NullSchema |
-  BooleanSchema
+  BooleanSchema |
+  UnionSchema
 ) | (ReferenceObject & UnknownSchema);