Contains checks whether the tagOptions contains the specified option.

test that Values(input) matches want. If not, report an error on t.

valueString returns the string representation of a value.

Values returns the url.Values encoding of v. Values expects to be passed a struct, and traverses it recursively using the following encoding rules.

isEmptyValue checks if a value should be considered empty for the purposes of omitting fields with the "omitempty" option.

parseTag splits a struct field's url tag into its name and comma-separated options.

reflectValue populates the values parameter from the struct fields in val. Embedded structs are followed recursively (using the rules defined in the V

EncodeValues using key name of the form "{key}.N" where N increments with each value. A value of "err" will return an error.

EncodeValues encodes values with leading underscores

EncodeValues encodes a 0 as false, 1 as true, and nil as unknown. All other values cause an error.

Test behavior when encoding is defined for a pointer of a custom type. Custom type should be able to encode values for nil pointers.

One of the few ways reflectValues will return an error is if a custom encoder returns an error. Test all of the various ways that can happen.