…t::setQty()

type casted $qty to float in \Magento\Catalog\Model\Product::setQty()

Description

Backport PR #18149

\Magento\Catalog\Model\Product::getQty() should return float/double now, as mentioned in it's Doc-block

Fixed Issues (if relevant)

1. Should getQty() return int/float or string? #18094: Should getQty() return int/float or string?

Manual testing scenarios

1. Observe any event like checkout_cart_product_add_after
2. In the Observer, get an instance of \Magento\Catalog\Model\Product
3. Calling the getQty method of the above-mentioned class would return a float/double instead of string, as expected

Contribution checklist

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)