Yii input mask cannot use period as thousand separator

[tonny-sofijan]

What steps will reproduce the problem?

Input decimal with format xxx.yyy.zzz (thousand separator with period)

What's expected?

use period for thousand separator

What do you get instead?

comma for thousand separator

Additional info

'clientOptions' => [
    'alias' => 'decimal',
    'groupSeparator' => '.',
    'autoGroup' => true,                    
]

Q	A
Yii version	2.0.15
Yii Masked Input version	~2.0.14
Yii JQuery version	3.2.1
JQuery Masked Input version	3.x
JQuery version	3.2.1
PHP version	7.2.10
Operating system	Archlinux