Changes post #4917: forcibly clear `_numberString` when new number to… #2527

Job	Run time
build (8, ubuntu-22.04)	2m 16s
build (11, ubuntu-22.04)	1m 4s
build (17, ubuntu-22.04)	1m 3s
build (21, ubuntu-22.04)	1m 1s
build (23, ubuntu-22.04)	57s
build (8, windows-latest, W)	1m 51s
Trigger downstream builds for v3	0s
Trigger downstream builds for v2 / Trigger downstream builds (FasterXML/jackson-databind)	2s
Trigger downstream builds for v2 / Trigger downstream builds (FasterXML/jackson-jr)	2s
	8m 16s

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