[gsi,gsidna] changed gsi serialnumber word to store int

Author: MrClock8163

CHANGELOG.md

@@ -12,6 +12,12 @@ The project uses [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 - Added testing for Python 3.14
 - Added logging of the instrument serial number to GeoCOM connection
 
+### Changed
+
+- Changed `GsiSerialnumberWord` to store value as `int` instead of `str`
+- Changed `get_serialnumber` measurement command on `GsiOnlineDNA` to return
+  `int` instead of `str` in the response object
+
 ## v0.14.0 (2025-10-18)
 
 ### Added

src/geocompy/gsi/dna/measurements.py

@@ -277,7 +277,7 @@ def get_temperature(self) -> GsiOnlineResponse[float]:
             gsi.GsiTemperatureWord
         ).map_value(_word_value)
 
-    def get_serialnumber(self) -> GsiOnlineResponse[str]:
+    def get_serialnumber(self) -> GsiOnlineResponse[int]:
         """
         ``GET 12``
 

src/geocompy/gsi/gsiformat.py

@@ -520,16 +520,65 @@ class GsiSerialnumberWord(GsiValueWord):
     def WI(cls) -> int:
         return 12
 
-    def __init__(self, serialnumber: str):
+    def __init__(self, serialnumber: int):
         """
         Parameters
         ----------
-        serialnumber : str
-            Serial number as string (as it might sometimes contain letters).
+        serialnumber : int
+            Serial number.
         """
-        self.value: str
+        self.value: int
         super().__init__(serialnumber)
 
+    @classmethod
+    def parse(cls, value: str) -> Self:
+        """
+        Parses serial number from a serialized GSI word.
+
+        Parameters
+        ----------
+        value : str
+            Serialized GSI word.
+
+        Returns
+        -------
+        Self
+        """
+        cls._check_format(value)
+
+        return cls(
+            int(value[7:-1].lstrip("0"))
+        )
+
+    def serialize(
+        self,
+        *,
+        gsi16: bool = False,
+        angleunit: GsiUnit | None = None,
+        distunit: GsiUnit | None = None
+    ) -> str:
+        """
+        Serialize data to GSI word text.
+
+        Parameters
+        ----------
+        gsi16 : bool, optional
+            Create GSI16 word instead of GSI8, by default False
+        angleunit : GsiUnit | None, optional
+            Unused, by default None
+        distunit : GsiUnit | None, optional
+            Unused, by default None
+
+        Returns
+        -------
+        str
+        """
+        return format_gsi_word(
+            self.wi,
+            str(self.value),
+            gsi16=gsi16
+        )
+
 
 class GsiInstrumentTypeWord(GsiValueWord):
     """``WI13`` Instrument type name."""