• Added factorial() and fact() built-in functions (Issue #69).
• Fixed an issue where the user-defined result precision was ignored during PDF and image exports (Issue #73).
• Improved total and average variables to preserve units and handle dimensional safety (Issue #74).
• Fixed precision loss bugs for very large numbers (Issue #80).
• Fixed mixed temperature addition and subtraction so values normalize consistently before arithmetic (Issue #83).
• PR: #85.