types+grammar: minor tweak
typo fixes
Merge pull request #164 from ecorkevin/edit

typo fixes
this+object prototypes: fixing code typo in ch6, per #164
types+grammar: discussion of numbers issues, closes #59, closes #67
types+grammar: lots more clarification around numbers, fixing some code formatting, closes #165
types+grammar: fixing trivial code formatting
types+grammar: clarified exponential form to include very small numbers
types+grammar: adding more on numbers like testing for integers and converting to 32-bit integers, closes #138
types+grammar: covering octal/binary/hex number literals syntax
types+grammar: adding ch2 discussion of 'string' values, and (not) just treating them as arrays of characters
types+grammar: few minor clarifications around strings vs. arrays
types+grammar: adding some discussion of working with arrays to ch2
types+grammar: adding more discussion of arrays with string vs number keys, to ch2
types+grammar: explaining in ch1 why types matter (for coercion), closes #169
types+grammar: adding discussion to ch2 of array-likes, and Array.from(..)
types+grammar: removing 'void' in ch1 code example in favor of ch2 coverage, closes #167
types+grammar: ch2, adding section header for 'void operator', per #167
types+grammar: ch4, adding more discussion around explicit vs implicit coercion
types+grammar: ch2, adding more intro text and summary text