Is it safe to change the precisionStep for a TrieField without doing a re-index?

Specifically, I want to change a field from this:
<fieldType name="tlong" class="solr.TrieLongField" precisionStep="8" 
omitNorms="true" positionIncrementGap="0"/>
to this:
<fieldType name="long" class="solr.TrieLongField" precisionStep="0" 
omitNorms="true" positionIncrementGap="0"/>

By "safe", I mean that searches will return the correct results, a FieldCache 
on the field will still work, clowns won't eat me...

-Michael

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