diff --git a/Classes/UUID.gd b/Classes/UUID.gd
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+# MIT License
+#
+# Copyright (c) 2023 Xavier Sellier
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+# Note: The code might not be as pretty it could be, since it's written
+# in a way that maximizes performance. Methods are inlined and loops are avoided.
+const BYTE_MASK: int = 0b11111111
+
+static func uuidbin():
+  randomize()
+  # 16 random bytes with the bytes on index 6 and 8 modified
+  return [
+	randi() & BYTE_MASK, randi() & BYTE_MASK, randi() & BYTE_MASK, randi() & BYTE_MASK,
+	randi() & BYTE_MASK, randi() & BYTE_MASK, ((randi() & BYTE_MASK) & 0x0f) | 0x40, randi() & BYTE_MASK,
+	((randi() & BYTE_MASK) & 0x3f) | 0x80, randi() & BYTE_MASK, randi() & BYTE_MASK, randi() & BYTE_MASK,
+	randi() & BYTE_MASK, randi() & BYTE_MASK, randi() & BYTE_MASK, randi() & BYTE_MASK,
+  ]
+
+static func uuidbinrng(rng: RandomNumberGenerator):
+  rng.randomize()
+  return [
+	rng.randi() & BYTE_MASK, rng.randi() & BYTE_MASK, rng.randi() & BYTE_MASK, rng.randi() & BYTE_MASK,
+	rng.randi() & BYTE_MASK, rng.randi() & BYTE_MASK, ((rng.randi() & BYTE_MASK) & 0x0f) | 0x40, rng.randi() & BYTE_MASK,
+	((rng.randi() & BYTE_MASK) & 0x3f) | 0x80, rng.randi() & BYTE_MASK, rng.randi() & BYTE_MASK, rng.randi() & BYTE_MASK,
+	rng.randi() & BYTE_MASK, rng.randi() & BYTE_MASK, rng.randi() & BYTE_MASK, rng.randi() & BYTE_MASK,
+  ]
+
+static func v4():
+  # 16 random bytes with the bytes on index 6 and 8 modified
+  var b = uuidbin()
+
+  return '%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x' % [
+	# low
+	b[0], b[1], b[2], b[3],
+
+	# mid
+	b[4], b[5],
+
+	# hi
+	b[6], b[7],
+
+	# clock
+	b[8], b[9],
+
+	# clock
+	b[10], b[11], b[12], b[13], b[14], b[15]
+  ]
+
+static func v4_rng(rng: RandomNumberGenerator):
+  # 16 random bytes with the bytes on index 6 and 8 modified
+  var b = uuidbinrng(rng)
+
+  return '%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x' % [
+	# low
+	b[0], b[1], b[2], b[3],
+
+	# mid
+	b[4], b[5],
+
+	# hi
+	b[6], b[7],
+
+	# clock
+	b[8], b[9],
+
+	# clock
+	b[10], b[11], b[12], b[13], b[14], b[15]
+	]