Test

Allow promoted readonly properties to be reassigned once in constructor #40

Job	Run time
Generate Matrix	11s
Suite / MACOS_ARM64_DEBUG_NTS	37m 3s
Suite / FREEBSD_NTS	12m 14s
Suite / ALPINE_X64_ASAN_DEBUG_ZTS	33m 16s
Suite / BENCHMARKING	15m 10s
Suite / LINUX_PPC64_ASAN_DEBUG_ZTS	0s
Suite / LINUX_X64_ASAN_DEBUG_ZTS	47m 32s
Suite / LINUX_X32_DEBUG_ZTS	14m 22s
Suite / WINDOWS_X64_ZTS	34m 26s
Suite / OPCACHE_VARIATION	0s
Suite / PECL	0s
Suite / LINUX_X64_RELEASE_NTS	28m 13s
Suite / LIBMYSQLCLIENT	-1s
Suite / MSAN	-1s
Suite / COVERAGE	-1s
Suite / COMMUNITY_${{ matrix.type }}	-1s
	3h 42m 23s

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