py/formatfloat: Calculate reference values with pow().#8985

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dpwe wants to merge 2 commits intomicropython:masterfrom

dpwe:format_float_with_pow

Commits on Aug 11, 2022

py/parsenum: Ensure that trailing zeros lead to identical results.
dpwe
committed
py/formatfloat: Uses pow(10, e) instead of pos/neg_pow lookup tables.
dpwe
committed