From 3fc16481fc9ae7ab16041010ce0d3757aa08d742 Mon Sep 17 00:00:00 2001
From: mwlon <m.w.loncaric@gmail.com>
Date: Thu, 12 Feb 2026 07:38:51 -0500
Subject: [PATCH 1/5] update pcodec

Signed-off-by: mwlon <m.w.loncaric@gmail.com>
---
 numcodecs/pcodec.py | 8 ++++----
 pyproject.toml      | 2 +-
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/numcodecs/pcodec.py b/numcodecs/pcodec.py
index e214f781..53774c44 100644
--- a/numcodecs/pcodec.py
+++ b/numcodecs/pcodec.py
@@ -27,7 +27,7 @@ class PCodec(Codec):
         structure of the data (e.g. approximate multiples of 0.1) to improve
         compression ratio, or skip this step and just use the numbers as-is
         (Classic mode). Note that the "try*" specs are not currently supported.
-    delta_spec : {"auto", "none", "try_consecutive", "try_lookback"}
+    delta_spec : {"auto", "no_op", "try_consecutive", "try_lookback"}
         Configures the delta encoding strategy. By default, uses "auto" which
         will try to infer the best encoding order.
     paging_spec : {"equal_pages_up_to"}
@@ -48,7 +48,7 @@ def __init__(
         level: int = 8,
         *,
         mode_spec: Literal["auto", "classic"] = "auto",
-        delta_spec: Literal["auto", "none", "try_consecutive", "try_lookback"] = "auto",
+        delta_spec: Literal["auto", "no_op", "try_consecutive", "try_lookback"] = "auto",
         paging_spec: Literal["equal_pages_up_to"] = "equal_pages_up_to",
         delta_encoding_order: int | None = None,
         equal_pages_up_to: int = DEFAULT_MAX_PAGE_N,
@@ -82,8 +82,8 @@ def _get_chunk_config(self):
             match self.delta_spec:
                 case "auto":
                     delta_spec = DeltaSpec.auto()
-                case "none":
-                    delta_spec = DeltaSpec.none()
+                case "no_op" | "none":  # legacy support for "none"
+                    delta_spec = DeltaSpec.no_op()
                 case "try_consecutive":
                     delta_spec = DeltaSpec.try_consecutive(self.delta_encoding_order)
                 case "try_lookback":
diff --git a/pyproject.toml b/pyproject.toml
index 164ba5dc..a1407633 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -54,7 +54,7 @@ zfpy = [
     "zfpy>=1.0.0"
 ]
 pcodec = [
-    "pcodec>=0.3,<0.4",
+    "pcodec>=1,<2",
 ]
 crc32c = [
     "crc32c>=2.7",

From c0f015025ca88aaec317555e1e49e71599ba43b0 Mon Sep 17 00:00:00 2001
From: mwlon <m.w.loncaric@gmail.com>
Date: Thu, 12 Feb 2026 07:41:19 -0500
Subject: [PATCH 2/5] add no_op to test

Signed-off-by: mwlon <m.w.loncaric@gmail.com>
---
 numcodecs/tests/test_pcodec.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/numcodecs/tests/test_pcodec.py b/numcodecs/tests/test_pcodec.py
index d0520b45..4afa17b0 100644
--- a/numcodecs/tests/test_pcodec.py
+++ b/numcodecs/tests/test_pcodec.py
@@ -25,6 +25,7 @@
     PCodec(delta_encoding_order=2),
     PCodec(delta_spec="try_lookback"),
     PCodec(delta_spec="none"),
+    PCodec(delta_spec="no_op"),
     PCodec(delta_spec="try_consecutive", delta_encoding_order=1),
 ]
 

From e0275c9c5c3deb837f6782cd9d398da309745a43 Mon Sep 17 00:00:00 2001
From: mwlon <m.w.loncaric@gmail.com>
Date: Thu, 12 Feb 2026 07:58:18 -0500
Subject: [PATCH 3/5] new test fixture

Signed-off-by: mwlon <m.w.loncaric@gmail.com>
---
 fixture/pcodec/codec.10/config.json    |   9 +++++++++
 fixture/pcodec/codec.10/encoded.00.dat | Bin 0 -> 1274 bytes
 fixture/pcodec/codec.10/encoded.01.dat | Bin 0 -> 1278 bytes
 fixture/pcodec/codec.10/encoded.02.dat | Bin 0 -> 1274 bytes
 fixture/pcodec/codec.10/encoded.03.dat | Bin 0 -> 1278 bytes
 fixture/pcodec/codec.10/encoded.04.dat | Bin 0 -> 1780 bytes
 fixture/pcodec/codec.10/encoded.05.dat | Bin 0 -> 5413 bytes
 fixture/pcodec/codec.10/encoded.06.dat | Bin 0 -> 5703 bytes
 fixture/pcodec/codec.10/encoded.07.dat | Bin 0 -> 5710 bytes
 fixture/pcodec/codec.10/encoded.08.dat | Bin 0 -> 7528 bytes
 fixture/pcodec/codec.10/encoded.09.dat | Bin 0 -> 581 bytes
 numcodecs/tests/test_pcodec.py         |   2 +-
 12 files changed, 10 insertions(+), 1 deletion(-)
 create mode 100644 fixture/pcodec/codec.10/config.json
 create mode 100644 fixture/pcodec/codec.10/encoded.00.dat
 create mode 100644 fixture/pcodec/codec.10/encoded.01.dat
 create mode 100644 fixture/pcodec/codec.10/encoded.02.dat
 create mode 100644 fixture/pcodec/codec.10/encoded.03.dat
 create mode 100644 fixture/pcodec/codec.10/encoded.04.dat
 create mode 100644 fixture/pcodec/codec.10/encoded.05.dat
 create mode 100644 fixture/pcodec/codec.10/encoded.06.dat
 create mode 100644 fixture/pcodec/codec.10/encoded.07.dat
 create mode 100644 fixture/pcodec/codec.10/encoded.08.dat
 create mode 100644 fixture/pcodec/codec.10/encoded.09.dat

diff --git a/fixture/pcodec/codec.10/config.json b/fixture/pcodec/codec.10/config.json
new file mode 100644
index 00000000..f5ae0a54
--- /dev/null
+++ b/fixture/pcodec/codec.10/config.json
@@ -0,0 +1,9 @@
+{
+    "delta_encoding_order": null,
+    "delta_spec": "no_op",
+    "equal_pages_up_to": 262144,
+    "id": "pcodec",
+    "level": 8,
+    "mode_spec": "auto",
+    "paging_spec": "equal_pages_up_to"
+}
\ No newline at end of file
diff --git a/fixture/pcodec/codec.10/encoded.00.dat b/fixture/pcodec/codec.10/encoded.00.dat
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diff --git a/fixture/pcodec/codec.10/encoded.07.dat b/fixture/pcodec/codec.10/encoded.07.dat
new file mode 100644
index 0000000000000000000000000000000000000000..658ab67603230fce2dbe9e332fc223fad3348ade
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diff --git a/fixture/pcodec/codec.10/encoded.08.dat b/fixture/pcodec/codec.10/encoded.08.dat
new file mode 100644
index 0000000000000000000000000000000000000000..71b72e72ebbbc71ac5ffd452c76c53e8bfb554ec
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diff --git a/fixture/pcodec/codec.10/encoded.09.dat b/fixture/pcodec/codec.10/encoded.09.dat
new file mode 100644
index 0000000000000000000000000000000000000000..0e71ca3d94ddaa3543634be1c2efdaca08b31493
GIT binary patch
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diff --git a/numcodecs/tests/test_pcodec.py b/numcodecs/tests/test_pcodec.py
index 4afa17b0..fe26b3c4 100644
--- a/numcodecs/tests/test_pcodec.py
+++ b/numcodecs/tests/test_pcodec.py
@@ -25,8 +25,8 @@
     PCodec(delta_encoding_order=2),
     PCodec(delta_spec="try_lookback"),
     PCodec(delta_spec="none"),
-    PCodec(delta_spec="no_op"),
     PCodec(delta_spec="try_consecutive", delta_encoding_order=1),
+    PCodec(delta_spec="no_op"),
 ]
 
 

From 63f05e9e1d7f56b51cc24fe992bcebb4ca123188 Mon Sep 17 00:00:00 2001
From: mwlon <m.w.loncaric@gmail.com>
Date: Thu, 12 Feb 2026 08:05:01 -0500
Subject: [PATCH 4/5] ignore line for legacy code

Signed-off-by: mwlon <m.w.loncaric@gmail.com>
---
 numcodecs/tests/test_pcodec.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/numcodecs/tests/test_pcodec.py b/numcodecs/tests/test_pcodec.py
index fe26b3c4..0ea32723 100644
--- a/numcodecs/tests/test_pcodec.py
+++ b/numcodecs/tests/test_pcodec.py
@@ -24,7 +24,7 @@
     PCodec(equal_pages_up_to=300),
     PCodec(delta_encoding_order=2),
     PCodec(delta_spec="try_lookback"),
-    PCodec(delta_spec="none"),
+    PCodec(delta_spec="none"),  # type: ignore[arg-type]
     PCodec(delta_spec="try_consecutive", delta_encoding_order=1),
     PCodec(delta_spec="no_op"),
 ]

From caa6064b4c269cfce52489e46ad7a367ecd7915f Mon Sep 17 00:00:00 2001
From: mwlon <m.w.loncaric@gmail.com>
Date: Thu, 12 Feb 2026 08:06:47 -0500
Subject: [PATCH 5/5] make none legal to avoid API change

Signed-off-by: mwlon <m.w.loncaric@gmail.com>
---
 numcodecs/pcodec.py            | 7 ++++---
 numcodecs/tests/test_pcodec.py | 2 +-
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/numcodecs/pcodec.py b/numcodecs/pcodec.py
index 53774c44..71add9b9 100644
--- a/numcodecs/pcodec.py
+++ b/numcodecs/pcodec.py
@@ -27,9 +27,10 @@ class PCodec(Codec):
         structure of the data (e.g. approximate multiples of 0.1) to improve
         compression ratio, or skip this step and just use the numbers as-is
         (Classic mode). Note that the "try*" specs are not currently supported.
-    delta_spec : {"auto", "no_op", "try_consecutive", "try_lookback"}
+    delta_spec : {"auto", "no_op", "none", "try_consecutive", "try_lookback"}
         Configures the delta encoding strategy. By default, uses "auto" which
-        will try to infer the best encoding order.
+        will try to infer the best encoding order. "none" is equivalent to
+        "no_op" and may be removed in the future.
     paging_spec : {"equal_pages_up_to"}
         Configures the paging strategy. Only "equal_pages_up_to" is currently
         supported.
@@ -48,7 +49,7 @@ def __init__(
         level: int = 8,
         *,
         mode_spec: Literal["auto", "classic"] = "auto",
-        delta_spec: Literal["auto", "no_op", "try_consecutive", "try_lookback"] = "auto",
+        delta_spec: Literal["auto", "no_op", "none", "try_consecutive", "try_lookback"] = "auto",
         paging_spec: Literal["equal_pages_up_to"] = "equal_pages_up_to",
         delta_encoding_order: int | None = None,
         equal_pages_up_to: int = DEFAULT_MAX_PAGE_N,
diff --git a/numcodecs/tests/test_pcodec.py b/numcodecs/tests/test_pcodec.py
index 0ea32723..fe26b3c4 100644
--- a/numcodecs/tests/test_pcodec.py
+++ b/numcodecs/tests/test_pcodec.py
@@ -24,7 +24,7 @@
     PCodec(equal_pages_up_to=300),
     PCodec(delta_encoding_order=2),
     PCodec(delta_spec="try_lookback"),
-    PCodec(delta_spec="none"),  # type: ignore[arg-type]
+    PCodec(delta_spec="none"),
     PCodec(delta_spec="try_consecutive", delta_encoding_order=1),
     PCodec(delta_spec="no_op"),
 ]