Array is tested in two places

I am not sure but it seems that these two files should be one file

https://github.com/godotengine/godot-benchmarks/blob/main/benchmarks/core/array.gd
https://github.com/godotengine/godot-benchmarks/blob/main/benchmarks/gdscript/array.gd

Compare benchmarks/core/array.gd with benchmarks/gdscript/array.gd and inspect how the repository organizes benchmark coverage. Determine whether they duplicate the same Array work or serve distinct purposes; done means the repository has a clear, agreed arrangement for these two files.

Written by the indexing model from the issue text.