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addressing a regression from #172510 that caused the assemble command to fail in the validation phase when a dart-define was passed as a base64-encoded value. Example command: ``` flutter --verbose assemble --no-version-check \ --output=<build_output_path>/ \ -dTargetPlatform=ios \ -dTargetFile=lib/main.dart \ -dBuildMode=release \ -dConfiguration=Debug \ -dIosArchs=arm64 \ -dSdkRoot=<xcode_sdk_path>/iPhoneOS.sdk \ -dSplitDebugInfo= \ -dTreeShakeIcons=false \ -dTrackWidgetCreation=true \ -dDartObfuscation=false \ -dAction=install \ -dFrontendServerStarterPath= \ --ExtraGenSnapshotOptions= \ --DartDefines=ZW52PXFh \ --ExtraFrontEndOptions= \ -dSrcRoot=<project_root> \ -dTargetDeviceOSVersion= \ -dCodesignIdentity=<codesign_identity> \ release_ios_bundle_flutter_assets ``` Partially addressing: https://github.com/flutter/flutter/issues/178452 ## Pre-launch Checklist - [x] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [x] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [x] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [x] I signed the [CLA]. - [x] I listed at least one issue that this PR fixes in the description above. - [ ] I updated/added relevant documentation (doc comments with `///`). - [x] I added new tests to check the change I am making, or this PR is [test-exempt]. - [x] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [x] All existing and new tests are passing. --------- Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com> Co-authored-by: Ben Konyi <bkonyi@google.com>