GitHub - tc39/proposal-decimal: Built-in decimal datatype in JavaScript

Accurate storage and processing of base-10 decimal numbers is a frequent need in JavaScript. Currently, developers sometimes represent these using libraries for this purpose, or sometimes use Strings. Sadly, JavaScript Numbers are also sometimes used, leading to real, end-user-visible rounding errors. What’s the issue? Why aren’t JS Numbers good enough? In what sense are they not “exact”? How is i

[yhara]

“in fact, the the 64-bit floating point number corresponding to 0.1 is actually 0.1000000000000000055511151231257827021181583404541015625.”

[efcl]

DecimalのProposal