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Add overloads to fix precision issues with g_sum #95

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Working with @tclune, these seem to be good edits to fix up the g_sum issue being seen in the CI in GEOS-ESM/FVdycoreCubed_GridComp#262

@mathomp4 mathomp4 added the 0 diff The changes in this pull request have verified to be zero-diff with the target branch. label Dec 19, 2023
@mathomp4 mathomp4 self-assigned this Dec 19, 2023
@mathomp4 mathomp4 marked this pull request as draft December 19, 2023 18:55
@mathomp4 mathomp4 requested a review from a team December 19, 2023 18:55
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Moving to draft until I can test with "normal" GEOS

@mathomp4 mathomp4 marked this pull request as ready for review December 19, 2023 20:05
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I have tested this with GEOSgcm in the "normal" way and it is zero-diff.

I then tried a run with:

DYCORE: FV3+ADV
AdvCore_Advection: 1

and it ran...but wasn't zero-diff to a non-ADV run. Should it be? (was faster though!)

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I also just ran gcm_regress.j in my FV3+ADV run and it passed. So...yay?

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