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Various function could change the tclass of xts objects. This would happen in calls to reclass(), period.apply(), and for logical operations on POSIXct indexes. Thanks to Tom Andrews for the report and testing, and to Panagiotis Cheilaris for contributing test cases (#322, #323).
plot.xts() now supports y-axis labels via 'ylab'. Thanks to Jasen Mackie for the suggestion and PR (#333, #334).
The API header has been updated to fix the signatures of do_merge_xts() and is_xts, which did not return a SEXP as required of functions callable by .Call(). Thanks to Tomas Kalibera for the report (#317), and Dirk Eddelbuettel for the PR (#337). This is a breaking change, but is required to avoid the potential for a segfault.
Michael Chirico added an internal isUTC() function to recognize many UTC- equivalent time zones (#319).
first() now operates correctly on non-xts objects when 'n = -1'. Previously it would always return the last two values. Thanks to GitHub user vxg20 for the report (#325).
The .xts() constructor would create an xts object with row names if 'x' had row names. This shouldn't happen, because xts objects do not have or support row names (#298).
Claymore Marshall added many examples of time-of-day subsetting to ?subset.xts. He also fixed a bug in time-of-day subsetting where subsetting by hour only returned wrong results (#304, #326, #328).
