`stansummary` save to CSV doesn't respect default significant figures

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@mitzimorris y travaille déjà.

Depuis le 28/3/2022.

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Description

bug
Summary:

Utility stansummary use of sig figs combined with scientific notation results in only 2 digit's worth of precision.

Description:

cf: https://github.com/stan-dev/cmdstanpy/issues/550#issuecomment-1081108389

It seems that the CSV output doesn't respect the default sig-figs that the docs cite.

without specifying -s:

name,Mean,MCSE,StdDev,5%,50%,95%,N_Eff,N_Eff/s,R_hat
"lp__",-7.29137,0.0194958,0.751762,-8.82028,-6.99659,-6.74977,1486.9,19062.8,0.999907
with -s 2

name,Mean,MCSE,StdDev,5%,50%,95%,N_Eff,N_Eff/s,R_hat
"lp__",-7.3,0.019,0.75,-8.8,-7,-6.7,1.5e+03,1.9e+04,1
I should note that the values displayed in stdout do seem to have a default value of 2 significant figures.

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Current Output:

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Expected Output:

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Additional Information:

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Current Version:

v2.29.2

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