Input Fallback Value is not merged on Input::merge()

[weierophinney]

I think the fallback value should be replaced when merge is done.

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Originally posted by @Maks3w at zendframework/zend-inputfilter#35

[weierophinney]

I think this is bug not a BC break. I don't think someone is relying on current behavior. But yes also it can be BC break, but very unlikely. This is not documented, no tests.. so I think we don't need to wait till 3.0

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Originally posted by @svycka at zendframework/zend-inputfilter#35 (comment)

[weierophinney]

Imho the intended behavior of merge is to also take care of the fallback value. Therefore this qualifies as a bugfix. I really would like to see this fixed asap.

        if ($input instanceof Input && $input->hasFallback()) {
            $this->setFallbackValue($input->getFallbackValue());
        }

ping @Maks3w

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Originally posted by @Netiul at zendframework/zend-inputfilter#35 (comment)

[weierophinney]

Fallback feature and merge method exists since a long time and nobody appreciate this before. My conclusion any change in the current behavior introduces a BC break.

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Originally posted by @Maks3w at zendframework/zend-inputfilter#35 (comment)