Decimal128Value
A 128-bit decimal, mirroring com.google.firebase.firestore.Decimal128Value from the Firebase Android SDK. Values are equal when they are numerically equal (1.0 and 1, 0 and -0, NaN and NaN), as on Android, where the SDK compares them as 128-bit binary floating-point numbers; here they are compared exactly as decimals, which differs only for values beyond that precision or range.
Throws
if stringValue is not a decimal.