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Magento product has specific rules for upgrading from one major version to another. Key distinction between major Magento versions is that a new major version is not backwards-compatible.

The topics below contain technical information on all formal backwards-incompatible changes.

Most of the changes are described in the following format:

Change

Was in Magento 1.x

Became in Magento 2.x

<description>

<code sample or feature>

<equivalent replacement, if any>

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