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‎.github/workflows/ci.yml‎

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name: CI
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on:
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push:
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branches:
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- main
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pull_request:
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branches:
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- '*'
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workflow_dispatch:
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concurrency:
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group: ci-${{ github.ref }}
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cancel-in-progress: true
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jobs:
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xcodebuild-latest:
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name: xcodebuild (16.2)
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if: |
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!contains(github.event.head_commit.message, '[ci skip]') &&
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!contains(github.event.head_commit.message, '[ci skip xcodebuild-latest]')
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runs-on: macos-15
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strategy:
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matrix:
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command: [test, '']
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platform: [IOS, MAC_CATALYST, MACOS, TVOS, VISIONOS, WATCHOS]
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xcode: ['16.2']
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steps:
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- uses: actions/checkout@v4
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- name: Select Xcode ${{ matrix.xcode }}
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run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app
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- name: Install visionOS runtime
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if: matrix.platform == 'visionOS'
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run: |
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sudo xcodebuild -runFirstLaunch
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sudo xcrun simctl list
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sudo xcodebuild -downloadPlatform visionOS
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sudo xcodebuild -runFirstLaunch
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- name: List available devices
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run: xcrun simctl list devices available
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- name: Cache derived data
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uses: actions/cache@v3
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with:
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path: |
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~/.derivedData
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key: |
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deriveddata-xcodebuild-${{ matrix.platform }}-${{ matrix.xcode }}-${{ matrix.command }}-${{ hashFiles('**/Sources/**/*.swift', '**/Tests/**/*.swift') }}
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restore-keys: |
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deriveddata-xcodebuild-${{ matrix.platform }}-${{ matrix.xcode }}-${{ matrix.command }}-
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- name: Set IgnoreFileSystemDeviceInodeChanges flag
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run: defaults write com.apple.dt.XCBuild IgnoreFileSystemDeviceInodeChanges -bool YES
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- name: Update mtime for incremental builds
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uses: chetan/git-restore-mtime-action@v2
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- name: Debug
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run: make XCODEBUILD_ARGUMENT="${{ matrix.command }}" CONFIG=Debug PLATFORM="${{ matrix.platform }}" WORKSPACE=Package.xcworkspace xcodebuild
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- name: Release
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if: matrix.skip_release != '1'
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run: make XCODEBUILD_ARGUMENT="${{ matrix.command }}" CONFIG=Release PLATFORM="${{ matrix.platform }}" WORKSPACE=Package.xcworkspace xcodebuild

‎.gitignore‎

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.DS_Store
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/.build
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/Packages
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xcuserdata/
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DerivedData/
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.swiftpm/configuration/registries.json
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.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
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.netrc

‎.spi.yml‎

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version: 1
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builder:
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configs:
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- documentation_targets: [ExistentialTrampoline]
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swift_version: 6.0

‎.swiftpm/xcode/package.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings‎

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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
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<plist version="1.0">
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<dict>
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<key>IDEWorkspaceSharedSettings_AutocreateContextsIfNeeded</key>
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<true/>
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</dict>
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</plist>

‎ACKNOWLEDGMENTS‎

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Initially I was challenged with the idea of creating AnyView from Any by https://github.com/glukianets at the end of 2k22.
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It was fun, I successfully passed the challenge, and now I challenge u, my reader, to implement similar thing without use of `_openExistential` (it is possible tho even more tricky) 😎
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And I left it behind until recently when I had to connect 2 mutually-dependent types and I'm glad I got baited to figure out about `_openExistential` back in 2k22 😅

‎LICENCE‎

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MIT License
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Copyright (c) 2025 CaptureContext
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.

‎Makefile‎

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CONFIG = Debug
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DERIVED_DATA_PATH = ~/.derivedData/$(CONFIG)
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PLATFORM_IOS = iOS Simulator,id=$(call udid_for,iOS,iPhone \d\+ Pro [^M])
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PLATFORM_MACOS = macOS
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PLATFORM_MAC_CATALYST = macOS,variant=Mac Catalyst
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PLATFORM_TVOS = tvOS Simulator,id=$(call udid_for,tvOS,TV)
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PLATFORM_VISIONOS = visionOS Simulator,id=$(call udid_for,visionOS,Vision)
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PLATFORM_WATCHOS = watchOS Simulator,id=$(call udid_for,watchOS,Watch)
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PLATFORM = IOS
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DESTINATION = platform="$(PLATFORM_$(PLATFORM))"
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PLATFORM_ID = $(shell echo "$(DESTINATION)" | sed -E "s/.+,id=(.+)/\1/")
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WORKSPACE = Package.xcworkspace
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SCHEME = swift-existential-container
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XCODEBUILD_ARGUMENT = test
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XCODEBUILD_FLAGS = \
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-configuration $(CONFIG) \
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-derivedDataPath $(DERIVED_DATA_PATH) \
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-destination $(DESTINATION) \
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-scheme "$(SCHEME)" \
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-skipMacroValidation \
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-workspace $(WORKSPACE)
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XCODEBUILD_COMMAND = xcodebuild $(XCODEBUILD_ARGUMENT) $(XCODEBUILD_FLAGS)
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ifneq ($(strip $(shell which xcbeautify)),)
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XCODEBUILD = set -o pipefail && $(XCODEBUILD_COMMAND) | xcbeautify --quiet
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else
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XCODEBUILD = $(XCODEBUILD_COMMAND)
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endif
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TEST_RUNNER_CI = $(CI)
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warm-simulator:
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@test "$(PLATFORM_ID)" != "" \
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&& xcrun simctl boot $(PLATFORM_ID) \
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&& open -a Simulator --args -CurrentDeviceUDID $(PLATFORM_ID) \
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|| exit 0
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xcodebuild: warm-simulator
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$(XCODEBUILD)
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# Workaround for debugging Swift Testing tests: https://github.com/cpisciotta/xcbeautify/issues/313
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xcodebuild-raw: warm-simulator
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$(XCODEBUILD_COMMAND)
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build-for-library-evolution:
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swift build \
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-q \
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-c release \
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--target "$(SCHEME)" \
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-Xswiftc -emit-module-interface \
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-Xswiftc -enable-library-evolution
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.PHONY: build-for-library-evolution format warm-simulator xcodebuild xcodebuild-raw
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define udid_for
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$(shell xcrun simctl list devices available '$(1)' | grep '$(2)' | sort -r | head -1 | awk -F '[()]' '{ print $$(NF-3) }')
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endef

‎Package.swift‎

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// swift-tools-version: 6.0
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import PackageDescription
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let package = Package(
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name: "swift-existential-container",
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products: [
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.library(
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name: "ExistentialContainer",
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targets: ["ExistentialContainer"]
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),
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],
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targets: [
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.target(name: "ExistentialContainer"),
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.testTarget(
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name: "ExistentialContainerTests",
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dependencies: [
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.target(name: "ExistentialContainer")
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]
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),
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]
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)

‎Package.xcworkspace/contents.xcworkspacedata‎

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‎Package.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist‎

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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
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<plist version="1.0">
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<dict>
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<key>IDEDidComputeMac32BitWarning</key>
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<true/>
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</dict>
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</plist>

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