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From bug 47431 comment #17:
> If we do decide to not include a pure-PHP [JSON] implementation, I will have to make
> two small changes to the installer, though that shouldn't be a big deal at
> all.
> 
> (a) Adding a new environmental check for json_encode() or json_decode()
> (b) Removing one of the two uses of Xml::encodeJsVar. This is for JS encoding
> an array of database types that doesn't seem to be used anywhere, and which
> in
> any case should be alphanumeric (thus simple to encode).