Minor - P4 1. Slightly off error message:
{
"query" : { },
"update" : {
"$set" : {
"$foo" : 1
}
},
"err" : "$foo is not valid for storage."
}
{
"query" : {},
"update" : {
"$set" : {"a.$foo" : 2}
},
"err" : "$foo is not valid for storage."
Suggest change to
"DollarPrefixedFieldName: $foo is not a valid field name"
I would prefer "a.$foo" instead of "$foo" in the second example.