Replace intval() function by using direct type casting to (int) where no default value is needed

[mage2pratik]

Description

Direct type casting is up to 6x faster than using casting functions like intval(). So this pull request replaces the intval() functions by direct type casting to (int) where no default value is needed.

Fixed Issues (if relevant)

1. [2.3] Changed intval($val) to (int) $val, since it is faster: #18035: [2.3] Changed intval($val) to (int) $val, since it is faster:

Manual testing scenarios

N/A

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)

[magento-engcom-team]

Hi @mage2pratik. Thank you for your contribution
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[magento-engcom-team]

Hi @mage2pratik. Thank you for your contribution.
We will aim to release these changes as part of 2.3.1.
Please check the release notes for final confirmation.