15.4.2 (January 6, 2017)

React

• Fixed build issues with the Brunch bundler. (@gaearon in #8686)
• Improved error messages for invalid element types. (@spicyj in #8612)
• Removed a warning about getInitialState when this.state is set. (@bvaughn in #8594)
• Removed some dead code. (@diegomura in #8050, @dfrownfelter in #8597)

React DOM

• Fixed a decimal point issue on uncontrolled number inputs. (@nhunzaker in #7750)
• Fixed rendering of textarea placeholder in IE11. (@aweary in #8020)
• Worked around a script engine bug in IE9. (@eoin in #8018)

React Addons

• Fixed build issues in RequireJS and SystemJS environments. (@gaearon in #8686)
• Added missing package dependencies. (@kweiberth in #8467)