util: fix numericSeparator handling for scientific notation #6399

Job	Run time
Build slim tarball	1m 11s
aarch64-linux: Cache V8 build	21s
aarch64-darwin: with shared libraries	26m 16s
x86_64-darwin: with shared libraries	40m 2s
x86_64-linux: with shared libraries	32m 0s
aarch64-linux: with shared openssl-3.0.19	26m 4s
aarch64-linux: with shared openssl-1.1.1w	25m 32s
aarch64-linux: with shared openssl-3.5.5	25m 55s
aarch64-linux: with shared openssl-3.6.1	26m 22s
aarch64-linux: with shared openssl-4.0.0	25m 55s
	3h 49m 38s

Provide feedback