-Custom variable name for sum/prod, eg. sum(k=1, 10, k) (breaking change)
-Vectors and matrices
-Functions that take vectors: min, max, average, perms, sort,
-length
-Vector comprehensions (experimental)
-Logical and/or/not
-true/false keywords
-mod keyword
-Nested sums and integrals
-Allow piecewise without 'otherwise' branch
-Show estimated fractions when displaying results
-Error handling for built-in functions and operations
-Numerical equation solving using Newton's method
-Result formatted with spaces, eg. 100 000
-Slightly improved formatting of results when using the --precision flag
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