Rules of thumb for choosing between storing information as struct field or static parameters

[mbauman]

See also

Overhead of dynamic dispatch?

There are a number of downsides to encoding a property of your thing in the type system: There will be more time spent in compilation — every time a different type hits a different function, Julia will compile a new specialized version just for that type. If this property is typically determined by a run-time value, then many functions working with your things will be type-unstable. Type-unstable variables can stymie optimizations, cause allocations and hit dynamic dispatch. Collections of ma…