Cast all branch labels to strings #1157
Merged
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This addresses a long-standing bug in auspice and closes #888. Casting branch labels to strings doesn't change how the labels render, but does allow restoration of zoom state via URL queries which always use strings.
Testing
Compare the behavior of this PR vs nextstrain.org for the flu/seasonal/h1n1pdm/ha/12y dataset which has numeric branch label values.
Additionally to this, as per #888 (comment), the augur schema should be updated to indicate that string label values should be used.