Additions

• Add support for ShadyDOM "noPatch" mode via Polymer.dom API (#5452, #5489)
• Add warnings related to changes from Polymer 1.x (#5474)

Fixes

• Various closure compiler fixes (#5424, #5506, #5462, #5465, #5466, #5467, #5480, #5483, #5495, #5502, #5506)
• Fix for #5503: Ensure default value from behavior is respected (#5504)
• Fix for #5250: Fix memory leak caused by debouncer flush queue (#5499, #5508)
• Fix for #5422: Ensure LegacyDataMixin applies to Templatizer instances (#5423)
• Allow ES6 class to be passed to legacy Polymer function (#5464)
• Disable auto strip-whitespace on template under legacyOptimizations setting (#5470)
• Fix for #5475: Ensure wildcard observer uses latest value during reentrant changes (#5476)