diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3b77a52d45..80e0451a9e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,7 +9,9 @@ The project does _not_ follow Semantic Versioning and the changes are documented
### Fixed
-- Physical units: The units `Joule`, `Coulomb` and `Watt` can now have also prefixes with negative metric scaling, e.g., `mW` (Milliwatt). Additionally, some typos have been corrected in the physical units documentation.
+- Physical units:
+ - The units `Joule`, `Coulomb` and `Watt` can now have also prefixes with negative metric scaling, e.g., `mW` (Milliwatt). Additionally, some typos have been corrected in the physical units documentation.
+ - The precision of number types with prefixed units (e.g. `mW` or `km`) was always set to `infinite` by the typesystem. Now, the precision is as precise as possible.
## December 2025
diff --git a/code/languages/org.iets3.opensource/languages/org.iets3.core.expr.simpleTypes/models/behavior.mps b/code/languages/org.iets3.opensource/languages/org.iets3.core.expr.simpleTypes/models/behavior.mps
index 24bbf6493c..16d3ba76c7 100644
--- a/code/languages/org.iets3.opensource/languages/org.iets3.core.expr.simpleTypes/models/behavior.mps
+++ b/code/languages/org.iets3.opensource/languages/org.iets3.core.expr.simpleTypes/models/behavior.mps
@@ -10,6 +10,7 @@
+
@@ -221,6 +222,18 @@
+
+
+
+
+
+
+
+
+
+
+
+
@@ -287,6 +300,7 @@
+
@@ -2613,6 +2627,38 @@
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
@@ -6136,6 +6182,79 @@
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
diff --git a/code/languages/org.iets3.opensource/languages/org.iets3.core.expr.typetags.physunits/models/org.iets3.core.expr.typetags.physunits.typesystem.mps b/code/languages/org.iets3.opensource/languages/org.iets3.core.expr.typetags.physunits/models/org.iets3.core.expr.typetags.physunits.typesystem.mps
index 96610efbe5..7c9ba5b53d 100644
--- a/code/languages/org.iets3.opensource/languages/org.iets3.core.expr.typetags.physunits/models/org.iets3.core.expr.typetags.physunits.typesystem.mps
+++ b/code/languages/org.iets3.opensource/languages/org.iets3.core.expr.typetags.physunits/models/org.iets3.core.expr.typetags.physunits.typesystem.mps
@@ -12526,13 +12526,31 @@
-
-
-
-
+
+
+
+
+
+
+
+
+
+
+
-
-
+
+
+
+
+
+
+
+
+
+
+
+
+
@@ -12554,24 +12572,209 @@
-
-
-
-
-
-
-
+
+
-
-
-
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
-
-
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
diff --git a/code/languages/org.iets3.opensource/tests/test.ts.expr.os/models/test.ts.expr.os.phyunits@tests.mps b/code/languages/org.iets3.opensource/tests/test.ts.expr.os/models/test.ts.expr.os.phyunits@tests.mps
index 252525534b..f975471d97 100644
--- a/code/languages/org.iets3.opensource/tests/test.ts.expr.os/models/test.ts.expr.os.phyunits@tests.mps
+++ b/code/languages/org.iets3.opensource/tests/test.ts.expr.os/models/test.ts.expr.os.phyunits@tests.mps
@@ -5521,6 +5521,137 @@
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
@@ -5732,7 +5863,7 @@
-
+
@@ -9439,7 +9570,7 @@
-
+