Update the docs on pre-release comparator handling

There has been confusion on the use of pre-releases in comparison
ranges. This attempts to add more detail to help end users
figure them out.

README.md

@@ -80,14 +80,25 @@ The basic comparisons are:
 * `>=`: greater than or equal to
 * `<=`: less than or equal to
 
-_Note, according to the Semantic Version specification pre-releases may not be
-API compliant with their release counterpart. It says,_
+## Working With Pre-release Versions
 
-> _A pre-release version indicates that the version is unstable and might not satisfy the intended compatibility requirements as denoted by its associated normal version._
+According to the Semantic Version specification pre-releases may not be
+API compliant with their release counterpart. It says,
 
-_SemVer comparisons without a pre-release value will skip pre-release versions.
-For example, `>1.2.3` will skip pre-releases when looking at a list of values
-while `>1.2.3-alpha.1` will evaluate pre-releases._
+> A pre-release version indicates that the version is unstable and might not satisfy the intended compatibility requirements as denoted by its associated normal version.
+
+SemVer comparisons without a pre-release value will skip pre-release versions.
+For example, `>=1.2.3` will skip pre-releases when looking at a list of values
+while `>=1.2.3-0` will evaluate and find pre-releases.
+
+The reason for the `0` as a pre-release version in the example comparison is
+because pre-releases can only contain ASCII alphanumerics and hyphens (along with
+`.` separators), per the spec. Sorting happens in ASCII sort order, again per the spec. The lowest character is a `0` in ASCII sort order (see an [ASCII Table](http://www.asciitable.com/))
+
+Understanding ASCII sort ordering is important because A-Z comes before a-z. That
+means `>=1.2.3-BETA` will return `1.2.3-alpha`. What you might expect from case
+sensitivity doesn't apply here. This is due to ASCII sort ordering which is what
+the spec specifies.
 
 ## Hyphen Range Comparisons