fix some bugs, suggest a wording change #1
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first pull request! not sure what normally goes in these descriptions, so let me know if i need to change this somehow.
i've updated the wording for the first problem to make it clear that it really wants the right value, and not just something with the right string representation. i failed this one initially.
i also used babel to determine whether dot and bracket notation were used. specifically this is done in assignments since both notations are used for access later in the file.
and finally, stray whitespace at end of lines was removed.