$versionPrefix = substr( $icuVersion, 0, 3 );
// Source: http://site.icu-project.org/download
$map = [
+ '57.' => '8.0',
+ '56.' => '8.0',
+ '55.' => '7.0',
+ '54.' => '7.0',
+ '53.' => '6.3',
+ '52.' => '6.3',
+ '51.' => '6.2',
'50.' => '6.2',
'49.' => '6.1',
'4.8' => '6.0',