static string|null normalize(string $version, int|null $precision)
Normalizes a version string to the number of components given in the parameter $precision.
A single digit release version and a single digit major version are contracted to a two digit release version. If no major version is given, it is substituted by zero.
Examples:
IcuVersion::normalize('1.2.3.4');
// => '12.3.4'
IcuVersion::normalize('1.2.3.4', 1);
// => '12'
IcuVersion::normalize('1.2.3.4', 2);
// => '12.3'
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