Forum

https://forum.exercism.org/t/flatten-array-mentions-both-lists-and-arrays/15849

Summary:

• Null-like values are optional according to the specifications; this has been clarified in the instructions.
• Added a clarification in the instructions that some tracks may contain data of different types.
• Replaced all references to lists with arrays in both the instructions and tests.
• Reimplemented tests that previously referred to lists in their descriptions; they now refer to arrays.
• Updated example in instructions with a more complex case.