refactor: use lowercase boolean in validation errors (#405)

Author: Pixel998

packages/object-schema/src/validation-strategy.js

@@ -30,7 +30,7 @@ export class ValidationStrategy {
 	 */
 	static boolean(value) {
 		if (typeof value !== "boolean") {
-			throw new TypeError("Expected a Boolean.");
+			throw new TypeError("Expected a boolean.");
 		}
 	}
 

packages/object-schema/tests/validation-strategy.test.js

@@ -22,25 +22,25 @@ describe("ValidationStrategy", () => {
 		it("should throw an error when the value is null", () => {
 			assert.throws(() => {
 				ValidationStrategy.boolean(null);
-			}, /Expected a Boolean/u);
+			}, /Expected a boolean/u);
 		});
 
 		it("should throw an error when the value is a string", () => {
 			assert.throws(() => {
 				ValidationStrategy.boolean("foo");
-			}, /Expected a Boolean/u);
+			}, /Expected a boolean/u);
 		});
 
 		it("should throw an error when the value is a number", () => {
 			assert.throws(() => {
 				ValidationStrategy.boolean(123);
-			}, /Expected a Boolean/u);
+			}, /Expected a boolean/u);
 		});
 
 		it("should throw an error when the value is an object", () => {
 			assert.throws(() => {
 				ValidationStrategy.boolean({});
-			}, /Expected a Boolean/u);
+			}, /Expected a boolean/u);
 		});
 	});