Now padding start and end of blocks with nils.
Improved code for padding input.
Fixes for bindings.
Fix for links.
Fix for decorators.
Fixed typo.
Added back support for manual casting of identifiers.
Added back support for mathematical operators.
Restored support for superscript, subscript, and primes.
Restored support for fractions.
Restored support for non-breaking spaces.
Improved support for non-breaking spaces.
Restored support for calling built-in functions.