qDebug() << QLocale( QLocale::Hindi, QLocale::India ).toString( 100000 );
    qDebug() << QLocale( QLocale::Hindi, QLocale::India ).toString( 100000.0, 'f' );

Outputs:

"1,00,000"
"100,000.000000"

It should return:

"1,00,000"
"1,00,000.000000"

It appears QLocale().toString( int ) was fixed in 5.14, but QLocale().toString( double ) wasn't.

Both are correct in Qt 6.5.1.

See also:

https://bugreports.qt.io/browse/QTBUG-24301