why numeric key is parse as StringNode

[zhuliquan]

https://github.com/antonmedv/expr/blob/d2100ece96affe6766d97e2cf0e4ca4d145f0d30/parser/parser.go#L454C32-L454C32
I am confused why numeric key is parse as ast.StringNode

[antonmedv]

Maps created in expr runtime can only be with string keys. map[string]any

[zhuliquan]

oh, I got it. but I think you should give instructions about map in the docs (https://github.com/zhuliquan/expr/blob/feature-reuse_common/docs/Language-Definition.md), otherwise someone may use result of vm.Run as map[int]interface{}