lib/index.js
function unsetIn(record, accessor, ctx) {
    return mutate(record, accessor, MutateType.setIn, void 0, ctx);
}
function unsetIn(record, accessor, ctx) {
    return mutate(record, accessor, MutateType.setIn, void 0, ctx);
}
function unsetIn ( record , accessor , ctx ) { return mutate ( record , accessor , MutateType . setIn , void 0 , ctx ) ; }
Unset a deep child

@param record The object to update, it can be a plain object or a class instance
@param accessor A lambda function to get the key path, support dot, [''], [""], [1], **do not** support dynamic variable, function call, e.g.
@param ctx Dynamic key map.
Unset a deep child