anchor.diff:  ** \param name The environment variable name
   */
   public func unset(cref name: string)
  -	-> !!yuni.env.unset(name.pod);
  +	-> !!nanyc.env.unset(name.pod);
   
   
   /*!
  
positive.code: ** \return The value of the env variable 'name' if it exists, an empty string otherwise
  */
  public func read(cref name: string): ref string
  	-> new string(pod: !!yuni.env.read(name.pod, null));
  
  
  /*!
  
negative.code: ** \return The value as a flag of the env variable 'name' if it exists, 'default' otherwise
  */
  public func read(cref asu64: string): ref u64
  	-> new u64(!!nanyc.env.asu64(asu64.pod, 0__u64));
  
  /*!
  ** \brief Read the value of an environment variable as unsigned 64bits integer
  