Link/Expressions: `App::PropertyEnumeration` returns a string if addressed through an `App::PropertyLink`

Is there an existing issue for this?

• I have searched the existing issues

Problem description

Most uses of an App::PropertyEnumeration in Expressions will return an integer (the index selected). When access is done through any variation of App::PropertyLink, the string is returned instead (bug).

I have found this occurs in every version of FreeCAD back to 0.21.2. I did not try any earlier versions.

A fix will likely break some existing projects relying on this to access the string, but it would be trivial to update such projects. Attached is a test case, showing some variations of access.

enumeration-link-bug.FCStd.delete.this.extension.zip

Full version info

OS: Gentoo Linux (KDE/plasma)
Word size of FreeCAD: 64-bit
Version: 0.22.0dev.37841 (Git) AppImage
Build type: Release
Branch: main
Hash: 5f761c758e2a0164b00a7183b9c0cbe32688e123
Python 3.11.9, Qt 5.15.13, Coin 4.0.2, Vtk 9.2.6, OCC 7.7.2
Locale: English/United States (en_US)
Installed mods: 
  * parts_library
  * Curves 0.6.40
  * A2plus 0.4.65 (Disabled)
  * DynamicData 2.62.0
  * Assembly4 0.50.13 (Disabled)
  * dodo 1.0.1
  * Alternate_OpenSCAD 1.0.0 (Disabled)
  * CurvedShapes 1.0.9
  * Design456 0.0.1
  * fasteners 0.5.24
  * SearchBar 1.0.2
  * Nodes 0.1.36 (Disabled)
  * 3D_Printing_Tools (Disabled)
  * workfeature (Disabled)
  * MnesarcoUtils 0.2.5
  * OpenTheme 2024.6.22
  * Manipulator 1.5.7
  * Assembly3 0.12.2 (Disabled)
  * lattice2 1.0.0
  * Launcher
  * CommandPanel
  * CubeMenu
  * Reinforcement
  * PieMenu 1.7.0
  * MeshRemodel 1.9.23

Subproject(s) affected?

Expressions

Anything else?

This bug is related to https://github.com/FreeCAD/FreeCAD/issues/14578

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