docs: add safe decimal scaling guidance with viem parseUnits/formatUnits#3468
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docs: add safe decimal scaling guidance with viem parseUnits/formatUnits#3468
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Add a new Safe decimal scaling section to Before You Build covering parseUnits and formatUnits from viem. Add caution boxes to Onchain Read and Writing Data Onchain pages linking to the new section.
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khadni
approved these changes
Feb 16, 2026
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Summary
Why
Floating-point arithmetic causes silent precision loss when scaling values to/from token decimals. For example, BigInt(0.1 * 1e18) yields
99999999999999984n instead of 100000000000000000n. viem parseUnits and formatUnits use string-based math to avoid this.
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