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Increase robustness of `XMLDocument` parser #3987

Job	Run time
Alpine Debug x86_64 (gcc)	6m 30s
Ubuntu Debug x64 (gcc)	6m 5s
Alpine Debug x86 (gcc)	6m 49s
Ubuntu Debug x64 (clang)	12m 59s
Windows Debug x64 (msvc)	13m 45s
Alpine Release x86_64 (gcc)	15m 57s
Ubuntu Release x64 (gcc)	6m 46s
Windows Debug x86 (msvc)	6m 55s
Alpine Release x86 (gcc)	16m 48s
Ubuntu Release x64 (clang)	12m 44s
Windows Mixed x64 (msvc)	11m 10s
Windows Mixed x86 (msvc)	10m 42s
macOS Debug	7m 4s
Windows Release x64 (msvc)	20m 51s
macOS Release	9m 16s
Windows Release x86 (msvc)	17m 44s
Windows Release Master Gold x64 (msvc)	10m 8s
Windows Release Master Gold x86 (msvc)	16m 0s
	3h 28m 13s

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