Content.ContentItemPublicContract

Type: object
Object Properties
contentId
Type: int64
cType
Type: string
cmsPath
Type: string
creationDate
Type: date-time
modifyDate
Type: date-time
allowComments
Type: boolean
hasAgeGate
Type: boolean
minimumAge
Type: int32
ratingImagePath
Type: string
author
autoEnglishPropertyFallback
Type: boolean
properties
Firehose content is really a collection of metadata and "properties", which are the potentially-but-not-strictly localizable data that comprises the meat of whatever content is being shown.

As Cole Porter would have crooned, "Anything Goes" with Firehose properties. They are most often strings, but they can theoretically be anything. They are JSON encoded, and could be JSON structures, simple strings, numbers etc... The Content Type of the item (cType) will describe the properties, and thus how they ought to be deserialized.
Type: object
Dictionary Contents: object
Dictionary Key Type: string
representations
Type: array
tags
NOTE: Tags will always be lower case.
Type: array
Array Contents: string
commentSummary