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https://issues.apache.org/jira/browse/LUCENE-8012?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16218331#comment-16218331
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Alan Woodward commented on LUCENE-8012:
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+1 to take Number. I tried converting things to use doubles as a followup to
LUCENE-7741, but this then complicated things in the various Similarity
implementations that use Explanation as a way of passing internal values
around. Using Number should tidy that up nicely.
> Improve Explanation class
> -------------------------
>
> Key: LUCENE-8012
> URL: https://issues.apache.org/jira/browse/LUCENE-8012
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Robert Muir
>
> Explanation class is currently nice and simple, and float matches the scoring
> api, but this does not work well for debugging numerical errors of internal
> calculations (it usually makes practical sense to use 64-bit double to avoid
> issues).
> Also it makes for nasty formatting of integral values such as number of
> tokens in the collection or even document's length, its just noise to see
> {{10.0}} there instead of {{10}}, and scientific notation for e.g. number of
> documents is just annoying.
> One idea is to take Number instead of float? Then you could pass in the
> correct numeric type (int,long,double,float) for internal calculations,
> parameters, statistics, etc, and output would look nice.
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