When adjusting quantity on the product page or cart page to any quantity, Zend Framework
isNumber() function fails to validate the number for numbers passed through in an
en_IN locale website. As a result, only a quantity of 1 is ever purchasable. It appears there is a difference in regex used to validate the number between
Someone appears to have logged an issue with ZF however I cannot find any resolution/patch https://framework.zend.com/issues/browse/ZF-12256.
This may also affect other parts of the website which use