diff --git a/include/nlohmann/detail/view/errors.hpp b/include/nlohmann/detail/view/errors.hpp
index 2b48d04b1..ff5816efd 100644
--- a/include/nlohmann/detail/view/errors.hpp
+++ b/include/nlohmann/detail/view/errors.hpp
@@ -55,9 +55,12 @@ template<typename BasicJsonType>
 {
     if (f.code == error_code::input_too_large)
     {
+        // LCOV_EXCL_START (4 GiB)
         NLOHMANN_VIEW_THROW(out_of_range::create(416, "input of 4 GiB or more is not supported by json_document", nullptr));
+        // LCOV_EXCL_STOP
     }
     const BasicJsonType accepted = BasicJsonType::parse(src, src + size, nullptr, true, ignore_comments, ignore_trailing_commas);
+    // LCOV_EXCL_START (only if parse() accepts what the view rejects: a bug)
     static_cast<void>(accepted);
 
     position_t pos;
@@ -74,6 +77,7 @@ template<typename BasicJsonType>
     }
     pos.chars_read_current_line = off + 1 - line_start;
     NLOHMANN_VIEW_THROW(parse_error::create(101, pos, "syntax error while parsing value", nullptr));
+    // LCOV_EXCL_STOP
 }
 
 }  // namespace view
diff --git a/include/nlohmann/json_view.hpp b/include/nlohmann/json_view.hpp
index 614f093ec..e9f37d2de 100644
--- a/include/nlohmann/json_view.hpp
+++ b/include/nlohmann/json_view.hpp
@@ -459,7 +459,7 @@ class basic_json_document
         bool ok = false;
         if (NLOHMANN_VIEW_UNLIKELY(size >= 0xFFFFFFF0u))
         {
-            failure.code = detail::view::error_code::input_too_large;
+            failure.code = detail::view::error_code::input_too_large; // LCOV_EXCL_LINE (4 GiB)
         }
         else
         {
diff --git a/single_include/nlohmann/json_view.hpp b/single_include/nlohmann/json_view.hpp
index fd87291d9..8dff3b47e 100644
--- a/single_include/nlohmann/json_view.hpp
+++ b/single_include/nlohmann/json_view.hpp
@@ -547,7 +547,8 @@ NLOHMANN_VIEW_ALWAYS_INLINE std::uint64_t parse_upto19(const unsigned char* p, u
     std::uint64_t w = 0;
     while (k >= 8)
     {
-        w = (w * 100000000u) + parse_upto8(p, 8, limit);
+        // (eight digits of the token: they lie below limit)
+        w = (w * 100000000u) + parse_eight_digits(read_eight_bytes(p));
         p += 8;
         k -= 8;
     }
@@ -801,10 +802,8 @@ class builder
             }
             if (c != '\\')
             {
-                if (NulIsEnd && c == 0)
-                {
-                    return failed(error_code::string_missing_quote, p);
-                }
+                // (a NUL before the end of the input is a control character, as
+                // for json::parse, also where a NUL ends the input between values)
                 return failed(c < 0x20 ? error_code::string_control_character : error_code::string_utf8, p);
             }
             ++p;
@@ -1626,9 +1625,12 @@ template<typename BasicJsonType>
 {
     if (f.code == error_code::input_too_large)
     {
+        // LCOV_EXCL_START (4 GiB)
         NLOHMANN_VIEW_THROW(out_of_range::create(416, "input of 4 GiB or more is not supported by json_document", nullptr));
+        // LCOV_EXCL_STOP
     }
     const BasicJsonType accepted = BasicJsonType::parse(src, src + size, nullptr, true, ignore_comments, ignore_trailing_commas);
+    // LCOV_EXCL_START (only if parse() accepts what the view rejects: a bug)
     static_cast<void>(accepted);
 
     position_t pos;
@@ -1645,6 +1647,7 @@ template<typename BasicJsonType>
     }
     pos.chars_read_current_line = off + 1 - line_start;
     NLOHMANN_VIEW_THROW(parse_error::create(101, pos, "syntax error while parsing value", nullptr));
+    // LCOV_EXCL_STOP
 }
 
 }  // namespace view
@@ -2483,7 +2486,7 @@ class basic_json_document
         bool ok = false;
         if (NLOHMANN_VIEW_UNLIKELY(size >= 0xFFFFFFF0u))
         {
-            failure.code = detail::view::error_code::input_too_large;
+            failure.code = detail::view::error_code::input_too_large; // LCOV_EXCL_LINE (4 GiB)
         }
         else
         {
diff --git a/tests/src/unit-json_view.cpp b/tests/src/unit-json_view.cpp
index eda6db9fe..4cfe9e40a 100644
--- a/tests/src/unit-json_view.cpp
+++ b/tests/src/unit-json_view.cpp
@@ -351,6 +351,11 @@ TEST_CASE("json_view")
         CHECK(reused.memory_usage() < grown);
         CHECK(reused.root().materialize() == json::parse(smaller));
 
+        // an empty document has nothing to release
+        json_document empty;
+        empty.shrink_to_fit();
+        CHECK(empty.memory_usage() == 0);
+
         // a small document stays in the storage block of the header
         json_document small = json_document::parse("[1,[2,3],{\"a\":\"b\\n\"}]"); // NOLINT(modernize-raw-string-literal)
         small.shrink_to_fit();