code: func (m *Meta) loadValuesFile(filename string) (map[string]cty.Value, tfdiags.Diagnostics) {
  	var diags tfdiags.Diagnostics
  	filename = m.normalizePath(filename)
  
  	loader, err := m.initConfigLoader()
  	if err != nil {
  		diags = diags.Append(err)
  		return nil, diags
  	}
  
  	vals, hclDiags := loader.Parser().LoadValuesFile(filename)
  	diags = diags.Append(hclDiags)
  	return vals, diags
  }
docs: // loadValuesFile loads a file that defines a single map of key/value pairs.
  // This is the format used for "tfvars" files.