Fix typo

[westin-m]

Closes #1873

Tested with repro in bug

[jennyf19]

[jennyf19]

wonder if this needs to be in a major version - thoughts @brentschmaltz ?

[pmaytak]

wonder if this needs to be in a major version - thoughts @brentschmaltz ?

Does it work currently at all? Like xsi:Type? If yes, I suppose this could be a breaking change, since folks rely on this behavior.

[westin-m]

Does it work currently at all? Like xsi:Type? If yes, I suppose this could be a breaking change, since folks rely on this behavior.

This works because xsi:type is what's expected. It's a runtime change, which I think should be fine to bring in.