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`toFixed(10)` switches to the exponential notation from 1e21 on, which isn't valid PDF syntax, and removing the trailing zeros then dropped a digit of the exponent: 1e30 was written "1e+3" and 1e100 "1e+1". Such a number, necessarily an integer, is now written with all its digits. The trailing zeros are removed with a backward scan, since `toFixed(10)` always produces exactly 10 decimals. Below the 1e21 limit its output is at most 33 characters long, so the previous `$`-anchored regex wasn't a performance issue.