cant not unmarshal name contain underline.

[hhniao]

Preflight Checklist

• I have searched the issue tracker for an issue that matches the one I want to file, without success.
• I am not looking for support or already pursued the available support channels without success.
• I have checked the troubleshooting guide for my problem, without success.

Viper Version

latest

Go Version

latest

Config Source

Files

Format

YAML

Repl.it link

No response

Code reproducing the issue

type disk struct {
	Abc           string `yaml:"abc" json:"abc"`
	AbcTest       string `yaml:"abc_test" json:"abc_test"`
	AbcString     string `yaml:"abc_string" json:"abc_string"`
	AbcInt        string `yaml:"abc_int" json:"abc_int"`
	AbcBool       string `yaml:"abc_bool" json:"abc_bool"`
	Cba           string `yaml:"cba" json:"cba"`
	TestUnderLine string `yaml:"test_under_line" json:"test_under_line"`
	TestCamel     string `yaml:"TestCamel" json:"TestCamel"`
	TestCamel1    string `yaml:"testCamel1" json:"testCamel1"`
}
var ddd disk
loadfile
...
...
viper.Unmarshal(&ddd) # cant unmarshal
sss := viper.AllSettings() # it is no problem, i can see abc,abctest

Abc = {string} "abc"
AbcTest = {string} ""
AbcString = {string} ""
AbcInt = {string} ""
AbcBool = {string} ""
Cba = {string} "cba"
TestUnderLine = {string} ""
TestCamel = {string} "TestCamel"
TestCamel1 = {string} "testCamel1"

Expected Behavior

as the viper.AllSettings() can be read all

Actual Behavior

disk.Abc not problem.
disk.AbcTest it is empty value, empty string, whaterve your type in struct

Steps To Reproduce

No response

Additional Information

No response

[github-actions]

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[sagikazarmark]

https://github.com/spf13/viper/blob/master/TROUBLESHOOTING.md#unmarshaling-doesnt-work