XLS: Number columns are losing precision

[onyxfish]

text,date,integer,boolean,float,datetime,empty_column,_unnamed
Chicago Reader,1971-01-01,40,True,1.0,1971-01-01T04:14:00,,
Chicago Sun-Times,1948-01-01,63,True,1.27,1948-01-01T14:57:13,,Extra data beyond headers will be trimmed
Chicago Tribune,1920-01-01,164,False,41800000.01,1920-01-01T00:00:00,,
This row has blanks,,,,,,,,
Unicode! Σ,,,,,,,,

text,date,integer,boolean,float,datetime,empty_column,
Chicago Reader,1971-01-01,40.0000000000,True,1.0000000000,1971-01-01 04:14:00,,
Chicago Sun-Times,1948-01-01,63.0000000000,True,1.2700000000,1948-01-01 14:57:13,,Extra data beyond headers will be trimmed
Chicago Tribune,1920-01-01,164.0000000000,False,41800000.0099999979,1920-01-01,,
This row has blanks,,,,,,,
Unicode! Σ,,,,,,,

[onyxfish]

This is an agate issue, not an agate-excel issue.