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The `_idedata` has been changed to `__idedata` in newer PlatformIO core versions per https://github.com/platformio/platformio-core/commit/158aabbdf23ed1ff8f5e3f01fb4ef1723a78d3bb. This change has broken the logic to expand out the `-iprefix PATH @INCLUDEFILE` argument into its individual include paths, causing Intellisense breakages on some VSCode systems and other IDEs that didn't handle these arguments correctly or in which the path was corrupted.