Failed to format TF file when the key value of tag is a number

Hi,I had a problem with terraformer. When the key value of the resource tag is a number, formatting TF file fails, which results in the template file not generating normally. Such as :
resource "****" "***"{ tags = { 123 = "123" qwe = "qwe" } }
Error message：
expected: IDENT | STRING | ASSIGN | LBRACE got NUMBER
I think this is a bug, and attributes should be numbers.

Reproduce the reported formatting failure with a resource whose tag key is numeric, using the example in the issue. Trace the parser or formatter entry point that reports “expected: IDENT | STRING | ASSIGN | LBRACE got NUMBER”; done means the HCL file formats successfully and the template is generated normally.

Written by the indexing model from the issue text.