openlane/user_project_wrapper: use string var
diff --git a/openlane/user_project_wrapper/config.json b/openlane/user_project_wrapper/config.json
index 388070c..bc02342 100644
--- a/openlane/user_project_wrapper/config.json
+++ b/openlane/user_project_wrapper/config.json
@@ -27,7 +27,7 @@
"MAGIC_ZEROIZE_ORIGIN": 0,
"FP_SIZING": "absolute",
"RUN_CVC": 0,
- "UNIT": 2.4,
+ "UNIT": "2.4",
"FP_IO_VEXTEND": "expr::2 * $UNIT",
"FP_IO_HEXTEND": "expr::2 * $UNIT",
"FP_IO_VLENGTH": "ref::$UNIT",
@@ -82,4 +82,4 @@
"MAGIC_WRITE_FULL_LEF": 0,
"FP_PDN_ENABLE_RAILS": 0
}
-}
\ No newline at end of file
+}