lib/measured/unit_system_builder.rb in measured-2.5.0 vs lib/measured/unit_system_builder.rb in measured-2.5.1

@@ -1,5 +1,6 @@
+# frozen_string_literal: true
 class Measured::UnitSystemBuilder
   def initialize
     @units = []
     @cache = nil
   end
@@ -43,11 +44,11 @@
     ["G", "giga", 9],
     ["T", "tera", 12],
     ["P", "peta", 15],
     ["E", "exa", 18],
     ["Z", "zetta", 21],
-    ["Y", "yotta", 24]
-  ]
+    ["Y", "yotta", 24],
+  ].map(&:freeze).freeze
 
   def build_si_units(name, aliases: [], value: nil)
     si_units = [build_unit(name, aliases: aliases, value: value)]
     SI_PREFIXES.each do |short, long, exp|
       long_names = aliases.map { |suffix| "#{long}#{suffix}" }