fix: prevent mismatch error when using default namespace on ancestor queries

[chrisrossi]

Also fixes bug that was discovered while working this where keys weren't properly inheriting the namespace of their parent.

Fixes #577

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[chrisrossi]

This supercedes #604, since I can't push to Carlos's fork.

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[chrisrossi]

Hi, @cguardia. Do you mind appeasing cla-bot by leaving a "@googlebot I consent." comment for us?

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[cguardia]

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