MarketVariantDetails(MarketVariantDetails)
gains a payload is a new key, and one that loses it is a key removed, with
nothing to keep in step. A market names the kinds that apply to it, which
today is at most one.
sets its own key on the value already there rather than replacing it.
{
"sports": {
"provider": "PREDICT_SPORTS",
"team": {
"id": 0,
"name": "string",
"abbreviation": "string",
"providerTeamId": "string"
},
"line": 0
}
}