Pure json response from jsonSerialize

[zek]

Fixes #547

[frederikbosch]

@zek Could you include a test for this? One that failed in the situation before your change, and now works with your change.

[zek]

One that failed in the situation before your change, and now works with your change.

I am not familiar with testing. I don't know how can I test "before your change" part but I added second part.

This PR actually is not critical but before this PR jsonSerialize function returns currency object.

array(2) { ["amount"]=> string(3) "100" ["currency"]=> object(Money\Currency)#738 (1) { ["code":"Money\Currency":private]=> string(3) "EUR" } }

I believe we must return

array(2) { ["amount"]=> string(3) "300" ["currency"]=> string(3) "EUR" }

[frederikbosch]

Thanks, look good to me. @sagikazarmark What do you think?

[frederikbosch]

Thanks @zek!

[alle]

@zek @frederikbosch Thank you very much, guys! ☺️