Fix some typos in chapter 2 section 1.4

[davedx]

I found the explanation about irrational numbers a little confusing. What is the difference between Decimal(20.5) and Decimal(20.2)? Maybe a little bit more of an explanation would be good here.

[ericxiao251]

Sure thing! It can get a bit technical and out of the scope though. Essentially 20.5 is impossible to represent exactly in bits (that’s why its super long), but 20.2 is easily representable (not suprisingly as it’s essentially a binary number). I will show an example :).

[ericxiao251]

Hey @davedx , I just updated the section to go into a bit more details about the difference in Decimal(20.5) and Decimal(20.2). I didn't go into too much as it would be a bit convoluted.

It basically boils down to how the numbers are represented in binary, I provided a link with an example of someone going through how you would calculate a similar value to Decimal(20.2), they used Decimal(263.3).

[davedx]

Looks good, thanks for clarifying it a bit more!