[GO] Generator creates identifiers starting with a number

Description

When calling the code generation with my yaml, identifiers are created that start with a number. However, the go compiler interprets them wrongly.
Example code:

/*
 * API Documentation
 *
 * Source of truth and network automation platform
 *
 * API version: 2.2.5 (2.2)
 * Generated by: Swagger Codegen (https://github.com/swagger-api/swagger-codegen.git)
 */
package nautobot

type PortTypeChoices string

// List of PortTypeChoices
const (
	8P8C__PortTypeChoices PortTypeChoices = "8p8c"
	8P6C__PortTypeChoices PortTypeChoices = "8p6c"
	8P4C__PortTypeChoices PortTypeChoices = "8p4c"
	8P2C__PortTypeChoices PortTypeChoices = "8p2c"
	6P6C__PortTypeChoices PortTypeChoices = "6p6c"
	6P4C__PortTypeChoices PortTypeChoices = "6p4c"
	6P2C__PortTypeChoices PortTypeChoices = "6p2c"
	4P4C__PortTypeChoices PortTypeChoices = "4p4c"
	4P2C__PortTypeChoices PortTypeChoices = "4p2c"
	GG45_PortTypeChoices PortTypeChoices = "gg45"
	TERA_4P_PortTypeChoices PortTypeChoices = "tera-4p"
	TERA_2P_PortTypeChoices PortTypeChoices = "tera-2p"
	TERA_1P_PortTypeChoices PortTypeChoices = "tera-1p"
	110PUNCH__PortTypeChoices PortTypeChoices = "110-punch"
	BNC_PortTypeChoices PortTypeChoices = "bnc"
	F_PortTypeChoices PortTypeChoices = "f"
	N_PortTypeChoices PortTypeChoices = "n"
	MRJ21_PortTypeChoices PortTypeChoices = "mrj21"
	FC_PortTypeChoices PortTypeChoices = "fc"
	LC_PortTypeChoices PortTypeChoices = "lc"
	LC_PC_PortTypeChoices PortTypeChoices = "lc-pc"
	LC_UPC_PortTypeChoices PortTypeChoices = "lc-upc"
	LC_APC_PortTypeChoices PortTypeChoices = "lc-apc"
	LSH_PortTypeChoices PortTypeChoices = "lsh"
	LSH_PC_PortTypeChoices PortTypeChoices = "lsh-pc"
	LSH_UPC_PortTypeChoices PortTypeChoices = "lsh-upc"
	LSH_APC_PortTypeChoices PortTypeChoices = "lsh-apc"
	LX5_PortTypeChoices PortTypeChoices = "lx5"
	LX5_PC_PortTypeChoices PortTypeChoices = "lx5-pc"
	LX5_UPC_PortTypeChoices PortTypeChoices = "lx5-upc"
	LX5_APC_PortTypeChoices PortTypeChoices = "lx5-apc"
	MPO_PortTypeChoices PortTypeChoices = "mpo"
	MTRJ_PortTypeChoices PortTypeChoices = "mtrj"
	SC_PortTypeChoices PortTypeChoices = "sc"
	SC_PC_PortTypeChoices PortTypeChoices = "sc-pc"
	SC_UPC_PortTypeChoices PortTypeChoices = "sc-upc"
	SC_APC_PortTypeChoices PortTypeChoices = "sc-apc"
	ST_PortTypeChoices PortTypeChoices = "st"
	CS_PortTypeChoices PortTypeChoices = "cs"
	SN_PortTypeChoices PortTypeChoices = "sn"
	SMA_905_PortTypeChoices PortTypeChoices = "sma-905"
	SMA_906_PortTypeChoices PortTypeChoices = "sma-906"
	URM_P2_PortTypeChoices PortTypeChoices = "urm-p2"
	URM_P4_PortTypeChoices PortTypeChoices = "urm-p4"
	URM_P8_PortTypeChoices PortTypeChoices = "urm-p8"
	SPLICE_PortTypeChoices PortTypeChoices = "splice"
	OTHER_PortTypeChoices PortTypeChoices = "other"
)

E.g. the 8P is interpreted as exponent, even though it's the type.
These are the errors I see with this file:

oapi-1      | ./model_port_type_choices.go:15:2: syntax error: unexpected literal 8P8, expected name
oapi-1      | ./model_port_type_choices.go:15:3: 'P' exponent requires hexadecimal mantissa
oapi-1      | ./model_port_type_choices.go:16:3: 'P' exponent requires hexadecimal mantissa
oapi-1      | ./model_port_type_choices.go:17:3: 'P' exponent requires hexadecimal mantissa
oapi-1      | ./model_port_type_choices.go:18:3: 'P' exponent requires hexadecimal mantissa
oapi-1      | ./model_port_type_choices.go:19:3: 'P' exponent requires hexadecimal mantissa
oapi-1      | ./model_port_type_choices.go:20:3: 'P' exponent requires hexadecimal mantissa
oapi-1      | ./model_port_type_choices.go:21:3: 'P' exponent requires hexadecimal mantissa
oapi-1      | ./model_port_type_choices.go:22:3: 'P' exponent requires hexadecimal mantissa
oapi-1      | ./model_port_type_choices.go:23:3: 'P' exponent requires hexadecimal mantissa
oapi-1      | ./model_port_type_choices.go:28:5: 'P' exponent requires hexadecimal mantissa

Swagger-codegen version

3.0.58

Command line used for generation

java -jar swagger-codegen-cli.jar generate -i swagger.yaml -l go -o /client -DpackageName=nautobot

Steps to reproduce

clone this repo/go to this branch:
https://github.com/TobiPeterG/go-nautobot/tree/switch-swagger-generator
find swagger.yaml in api folder
generate code using swagger

Suggest a fix/enhancement

Identifiers starting with a number could be prefixed.

Start with api/swagger.yaml in the linked reproduction branch, generate the Go client with the documented Swagger Codegen command, and inspect model_port_type_choices.go. Done means identifiers derived from numeric-leading values are valid Go identifiers and the generated file compiles without the reported syntax errors.