Description:

This PR fixes cloneDeep util to not throw an error when cloning non-objects

Fixes:

• cloneDeep should not throw an error when cloning non-objects:
  • If pass undefined to JSON.parse() an SyntaxError will be thrown: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/parse#exceptions
  • JSON.stringify() can return undefined when passing in "pure" values like JSON.stringify(undefined), JSON.stringify(Symbol('a')), JSON.stringify(() => {})
    https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify#description

PR status:

• Version bumped
• Change-log updated
• Tests added or updated
• PR keeps 100% test coverage
• Type definition updated
• Readme updated
• Linter is applied
• Const arrow functions are used instead of pure function definitions where applicable
• Functions are listed in alphabetic order in index.js, index.d.ts and readme