Assigning custom properties to a marker when creating/copying it is deprecated. Please, consider storing the custom properties you need in some other object in your package, keyed by the marker's id property.

[andriy-trofimov-lebara]

Function.extractParams - :131698:20
MarkerLayer.markRange - :74798:77
TextBuffer.markRange - :32135:44
newMarkers.forEach.marker - /Users/atrofimov/.atom/packages/livestyle-atom/lib/analyzer/index.js:225:16
Set.forEach - native
markBufferWithAnalyzerData - /Users/atrofimov/.atom/packages/livestyle-atom/lib/analyzer/index.js:224:16