v2.4.0

• Improved: now several consecutive operators are available, e.g. 10/--++2
• Improved: a decimal number can be given as 1. or .1 which is equal to 1.0 or 0.1
• Added: constant Inf
• Added: processing of NaN
• Added: unit tests
• Fixed: PHP message "Notice: Undefined offset" in some cases
• Refactored: class properties and names of several methods
• Refactored: short syntax to arrays
• Updated: composer.json
• Updated: PHPDoc
• Updated: readme