I will be using tinyexpr-plusplus in an embedded solution on a ARM Cortex M0+ (RP2040) Microcontroller without hardware FPU, and I imagine using float rather than double internally in tinyexpr-plusplus would provide quite a bit of a performance improvement.

What would be the best way to make tinyexpr-plusplus use float rather than double as the internal (and external) data type?

As I see it, there are two workable paths for such a change

1. using a typedef

   typedef float te_type;
   ...
   te_type evaluate();

2. Using a class template argument in the te classes

   template <class T>
   class te_parser {
   ...
   T evaluate();
   ...
   void add_variable_or_function(te_variable<T> var)

While using a template argument would be the most "pure" C++ solution, using typedef would likely be the least invasive – and most backward compatible – approach.

If I go ahead and ...

1. fork the repository
2. go through the replace double with te_type/T excercise
3. determine if it provides a non-trivial performance improvement

... would there be any chance to have this change accepted as a pull request back into tinyexpr-plusplus so I dont have to keep tracking upstream changes and make similar type-changes to any new code?