chore: clean-up and update documentation

---
type: pre_commit_static_analysis_report
description: Results of running static analysis checks when committing changes.
report:
  - task: lint_filenames
    status: passed
  - task: lint_editorconfig
    status: passed
  - task: lint_markdown
    status: passed
  - task: lint_package_json
    status: na
  - task: lint_repl_help
    status: passed
  - task: lint_javascript_src
    status: passed
  - task: lint_javascript_cli
    status: na
  - task: lint_javascript_examples
    status: na
  - task: lint_javascript_tests
    status: passed
  - task: lint_javascript_benchmarks
    status: na
  - task: lint_python
    status: na
  - task: lint_r
    status: na
  - task: lint_c_src
    status: na
  - task: lint_c_examples
    status: na
  - task: lint_c_benchmarks
    status: na
  - task: lint_c_tests_fixtures
    status: na
  - task: lint_shell
    status: na
  - task: lint_typescript_declarations
    status: passed
  - task: lint_typescript_tests
    status: na
  - task: lint_license_headers
    status: passed
---

Author: kgryte

lib/node_modules/@stdlib/object/assign/README.md

@@ -73,6 +73,7 @@ var bool = ( z === x );
 
 -   If a property key is present in multiple sources, the property from the last source that defines the key prevails.
 -   The target object is mutated.
+-   Both string and symbol properties are copied.
 
 </section>
 

lib/node_modules/@stdlib/object/assign/docs/repl.txt

@@ -6,6 +6,8 @@
     If a property key is present in multiple sources, the property from the last
     source that defines the key prevails.
 
+    Both string and symbol properties are copied.
+
     The target object is mutated.
 
     Parameters

lib/node_modules/@stdlib/object/assign/docs/types/index.d.ts

@@ -25,6 +25,7 @@
 *
 * -   If a property key is present in multiple sources, the property from the last source that defines the key prevails.
 * -   The target object is mutated.
+* -   Both string and symbol properties are copied.
 *
 * @param target - target object
 * @param source - source object
@@ -51,6 +52,7 @@ declare function assign<T extends object, U>( target: T, source: U ): T & U;
 *
 * -   If a property key is present in multiple sources, the property from the last source that defines the key prevails.
 * -   The target object is mutated.
+* -   Both string and symbol properties are copied.
 *
 * @param target - target object
 * @param source1 - first source object
@@ -67,6 +69,7 @@ declare function assign<T extends object, U, V>( target: T, source1: U, source2:
 *
 * -   If a property key is present in multiple sources, the property from the last source that defines the key prevails.
 * -   The target object is mutated.
+* -   Both string and symbol properties are copied.
 *
 * @param target - target object
 * @param source1 - first source object
@@ -84,6 +87,7 @@ declare function assign<T extends object, U, V, W>( target: T, source1: U, sourc
 *
 * -   If a property key is present in multiple sources, the property from the last source that defines the key prevails.
 * -   The target object is mutated.
+* -   Both string and symbol properties are copied.
 *
 * @param target - target object
 * @param source - source object(s)

lib/node_modules/@stdlib/object/assign/lib/builtin.js

@@ -27,6 +27,7 @@
 *
 * -   If a property key is present in multiple sources, the property from the last source that defines the key prevails.
 * -   The target object is mutated.
+* -   Both string and symbol properties are copied.
 *
 * @name assign
 * @type {Function}

lib/node_modules/@stdlib/object/assign/lib/polyfill.js

@@ -34,6 +34,7 @@ var format = require( '@stdlib/string/format' );
 *
 * -   If a property key is present in multiple sources, the property from the last source that defines the key prevails.
 * -   The target object is mutated.
+* -   Both string and symbol properties are copied.
 *
 * @param {Object} target - target object
 * @param {...Object} source - source object(s)

lib/node_modules/@stdlib/object/assign/test/test.builtin.js

@@ -49,7 +49,7 @@ tape( 'the function throws an error if provided `undefined` or `null` as a targe
 	var i;
 
 	values = [
-		undefined,
+		void 0,
 		null
 	];
 

lib/node_modules/@stdlib/object/assign/test/test.polyfill.js

@@ -46,7 +46,7 @@ tape( 'the function throws an error if provided `undefined` or `null` as a targe
 	var i;
 
 	values = [
-		undefined,
+		void 0,
 		null
 	];