I am aware of how JavaScript numbers are all 64 bit floats, as defined in the IEEE 754 standard, and the ramifications of that when performing computations, as per:
Is floating point math broken?
(and many other questions)
What I don't understand is how JavaScript numbers somehow retain their original precision. As an example, if you assign a value of 0.1 to a variable, when viewing in the debugger, or outputting to the console it is reported as having exactly that value:
const foo = 0.1
console.log(foo); // reports 0.1
However, 0.1 is not representable as a double precision float, so that actual value of foo is 0.10000000149011612. Why is it not reported as that in the above example? And where is the additional precision information stored?
