fromWei and toWei accept int as units

[luu-alex]

came in internally:
background, i have backed that return token name, value, and decimal
Want to transform value to a value represented with decimal point
So issue is when i want to use fromWei it requires unit but unit is string (as a key from ethUnitMap) but i have digit representative (18 will be ether)
What is the best approach to usage for fromWei when i only have decimal point?

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