find_file: different results for same predefined cache variable
I just discovered a strange behavior, and I am not sure if it is on purpose or not. The following `CMake` snippet is used: ```cmake cmake_minimum_required(VERSION 3.1...3.21) project(Test LANGUAGES NONE) file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/my_file.txt" "") find_file(MY_FILE NAMES my_file.txt PATHS "${CMAKE_CURRENT_BINARY_DIR}") message("RESULT: ${MY_FILE}") ``` 1. Evaluating this `CMakeLists.txt` display, as expected, `RESULT: .../my_file.txt`. 2. Now with command line `cmake -DMY_FILE=NOTFOUND`, we get `RESULT: NOTFOUND` rather than the expected `.../my_file.txt`. 3. And if we add type to the variable on the command line, i.e. `cmake -DMY_FILE:FILEPATH=NOTFOUND`, we get the expected result: `RESULT: .../my_file.txt`. Is the behavior of item `2` a bug or not?
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