When the Ruby string contains a Unicode Line Separator character (http://www.fileformat.info/info/unicode/char/2028/index.htm), this library incorrectly generates the final JSON, which causes SyntaxError: Unexpected token ILLEGAL (in Chrome) and Unexpected EOF in Safari, etc.

"Home by Edward Sharpe & the Magnetic Zeros\u2028".to_json
# "\"Home by Edward Sharpe \\u0026 the Magnetic Zeros\u2028\""

should be

# "\"Home by Edward Sharpe \\u0026 the Magnetic Zeros\\u2028\""

As far as I can tell, the JSON spec and browsers treat U+2028/2029 as valid line separator characters, which are not allowed to occur within strings.