String "1E10" is incorrectly formatted as float #266
Description
With tabulate 0.9.0 on Python 3.9:
$ python -c "from tabulate import tabulate; print(tabulate([['1E10']]))"
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1e+10
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When the value goes beyond a certain limit (the upper limit for 64-bit Python float), it accepts that it is a string:
$ python -c "from tabulate import tabulate; print(tabulate([['1E308']]))"
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1e+308
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$ python -c "from tabulate import tabulate; print(tabulate([['1E309']]))"
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1E309
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