From 513554efd350d5acffba0b6c0c1e787161052bf9 Mon Sep 17 00:00:00 2001
From: Kimoon Han <khan@kaist.ac.kr>
Date: Thu, 19 Dec 2024 13:45:13 +0900
Subject: [PATCH] fix: enforce strict monotonicity check in data loader

---
 src/erlab/io/dataloader.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/erlab/io/dataloader.py b/src/erlab/io/dataloader.py
index 586f0558..5a374397 100644
--- a/src/erlab/io/dataloader.py
+++ b/src/erlab/io/dataloader.py
@@ -1413,7 +1413,10 @@ def _combine_multiple(
             if (
                 len(coord_dict) > 1
                 and len(data_list) > 1
-                and all(is_monotonic(np.asarray(v)) for v in coord_dict.values())
+                and all(
+                    is_monotonic(np.asarray(v), strict=True)
+                    for v in coord_dict.values()
+                )
             ):
                 # We rename with process_keys after assigning coords and expanding dims.
                 # This is necessary to ensure that coordinate_attrs are preserved.