From 739dba2ba1df676691219be794158c73001d5def Mon Sep 17 00:00:00 2001
From: zacharyburnett <zburnett@stsci.edu>
Date: Fri, 25 Oct 2024 12:04:45 -0400
Subject: [PATCH] default `memmap=False`

---
 asdf/_asdf.py            | 9 +++++----
 changes/1801.general.rst | 1 +
 2 files changed, 6 insertions(+), 4 deletions(-)
 create mode 100644 changes/1801.general.rst

diff --git a/asdf/_asdf.py b/asdf/_asdf.py
index 3a5d4a3fb..8eb220b3e 100644
--- a/asdf/_asdf.py
+++ b/asdf/_asdf.py
@@ -57,7 +57,8 @@ def __init__(
         extensions=None,
         version=None,
         ignore_unrecognized_tag=False,
-        memmap=True,
+        ignore_implicit_conversion=NotSet,
+        memmap=False,
         lazy_load=True,
         custom_schema=None,
     ):
@@ -88,7 +89,7 @@ def __init__(
 
         memmap : bool, optional
             When `True`, when reading files, attempt to memmap underlying data
-            arrays when possible. Defaults to ``True``.
+            arrays when possible. Defaults to ``False``.
 
         lazy_load : bool, optional
             When `True` and the underlying file handle is seekable, data
@@ -1510,7 +1511,7 @@ def open_asdf(
     extensions=None,
     ignore_unrecognized_tag=False,
     _force_raw_types=False,
-    memmap=True,
+    memmap=False,
     lazy_tree=NotSet,
     lazy_load=True,
     custom_schema=None,
@@ -1549,7 +1550,7 @@ def open_asdf(
 
     memmap : bool, optional
         When `True`, when reading files, attempt to memmap underlying data
-        arrays when possible. Defaults to ``True``.
+        arrays when possible. Defaults to ``False``.
 
     lazy_load : bool, optional
         When `True` and the underlying file handle is seekable, data
diff --git a/changes/1801.general.rst b/changes/1801.general.rst
new file mode 100644
index 000000000..ca218ddc5
--- /dev/null
+++ b/changes/1801.general.rst
@@ -0,0 +1 @@
+set ``memmap=False`` by default