Make expressions immutable and improve performance #2197

Job	Run time
Build (Ubuntu GCC Release Shared, ubuntu-latest, gcc, g++, Release, ON)	22m 5s
Build (Ubuntu GCC Debug Static, ubuntu-latest, gcc, g++, Debug, OFF)	22m 3s
Build (Ubuntu Clang Release Shared, ubuntu-latest, clang, clang++, Release, ON)	22m 5s
Build (Ubuntu Clang Debug Static, ubuntu-latest, clang, clang++, Debug, OFF)	22m 5s
Build (macOS GCC Release Shared, macos-13, gcc, g++, Release, ON)	22m 5s
Build (macOS GCC Debug Static, macos-13, gcc, g++, Debug, OFF)	22m 4s
Build (macOS Clang Release Shared, macos-13, clang, clang++, Release, ON)	22m 4s
Build (macOS Clang Debug Static, macos-13, clang, clang++, Debug, OFF)	22m 6s
Build (Windows GCC Release Shared, windows-latest, gcc, g++, Release, ON)	22m 2s
Build (Windows GCC Debug Static, windows-latest, gcc, g++, Debug, OFF)	21m 44s
Build (Windows Clang Release Shared, windows-latest, clang, clang++, Release, ON)	22m 4s
Build (Windows Clang Debug Static, windows-latest, clang, clang++, Debug, OFF)	21m 57s
Build (Windows MSVC Release Shared, windows-latest, msvc, msvc, Release, ON)	22m 2s
Build (Windows MSVC Debug Static, windows-latest, msvc, msvc, Debug, OFF)	21m 56s
	5h 8m 22s

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