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diff --git a/web/server/h2o/libh2o/deps/mruby/mrblib/numeric.rb b/web/server/h2o/libh2o/deps/mruby/mrblib/numeric.rb
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+##
+# Numeric
+#
+# ISO 15.2.7
+class Numeric
+  include Comparable
+  ##
+  # Returns the receiver simply.
+  #
+  # ISO 15.2.7.4.1
+  def +@
+    self
+  end
+
+  ##
+  # Returns the receiver's value, negated.
+  #
+  # ISO 15.2.7.4.2
+  def -@
+    0 - self
+  end
+
+  ##
+  # Returns the absolute value of the receiver.
+  #
+  # ISO 15.2.7.4.3
+  def abs
+    if self < 0
+      -self
+    else
+      self
+    end
+  end
+end
+
+##
+# Integral
+#
+# mruby special - module to share methods between Floats and Integers
+#                 to make them compatible
+module Integral
+  ##
+  # Calls the given block once for each Integer
+  # from +self+ downto +num+.
+  #
+  # ISO 15.2.8.3.15
+  def downto(num, &block)
+    return to_enum(:downto, num) unless block
+
+    i = self.to_i
+    while i >= num
+      block.call(i)
+      i -= 1
+    end
+    self
+  end
+
+  ##
+  # Returns self + 1
+  #
+  # ISO 15.2.8.3.19
+  def next
+    self + 1
+  end
+  # ISO 15.2.8.3.21
+  alias succ next
+
+  ##
+  # Calls the given block +self+ times.
+  #
+  # ISO 15.2.8.3.22
+  def times &block
+    return to_enum :times unless block
+
+    i = 0
+    while i < self
+      block.call i
+      i += 1
+    end
+    self
+  end
+
+  ##
+  # Calls the given block once for each Integer
+  # from +self+ upto +num+.
+  #
+  # ISO 15.2.8.3.27
+  def upto(num, &block)
+    return to_enum(:upto, num) unless block
+
+    i = self.to_i
+    while i <= num
+      block.call(i)
+      i += 1
+    end
+    self
+  end
+
+  ##
+  # Calls the given block from +self+ to +num+
+  # incremented by +step+ (default 1).
+  #
+  def step(num=nil, step=1, &block)
+    raise ArgumentError, "step can't be 0" if step == 0
+    return to_enum(:step, num, step) unless block
+
+    i = if num.kind_of? Float then self.to_f else self end
+    if num == nil
+      while true
+        block.call(i)
+        i+=step
+      end
+      return self
+    end
+    if step > 0
+      while i <= num
+        block.call(i)
+        i += step
+      end
+    else
+      while i >= num
+        block.call(i)
+        i += step
+      end
+    end
+    self
+  end
+end
+
+##
+# Integer
+#
+# ISO 15.2.8
+class Integer
+  include Integral
+  ##
+  # Returns the receiver simply.
+  #
+  # ISO 15.2.8.3.14
+  def ceil
+    self
+  end
+
+  ##
+  # Returns the receiver simply.
+  #
+  # ISO 15.2.8.3.17
+  def floor
+    self
+  end
+
+  ##
+  # Returns the receiver simply.
+  #
+  # ISO 15.2.8.3.24
+  alias round floor
+
+  ##
+  # Returns the receiver simply.
+  #
+  # ISO 15.2.8.3.26
+  alias truncate floor
+end
+
+##
+# Float
+#
+# ISO 15.2.9
+class Float
+  # mruby special - since mruby integers may be upgraded to floats,
+  # floats should be compatible to integers.
+  include Integral
+end