diff --git a/.gitignore b/.gitignore
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diff --git a/doc/._.DS_Store b/doc/._.DS_Store
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diff --git a/doc/._guf_dict-diagram.png b/doc/._guf_dict-diagram.png
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diff --git a/doc/guf_dict-diagram.png b/doc/guf_dict-diagram.png
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diff --git a/src/guf_alloc.h b/src/guf_alloc.h
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diff --git a/src/guf_alloc_libc.h b/src/guf_alloc_libc.h
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diff --git a/src/guf_alloc_tracker.h b/src/guf_alloc_tracker.h
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diff --git a/src/guf_assert.h b/src/guf_assert.h
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index 21a1023..1077185
--- a/src/guf_assert.h
+++ b/src/guf_assert.h
@@ -26,6 +26,7 @@ typedef enum guf_err {
     GUF_ERR_NOT_FOUND,
     GUF_ERR_ALREADY_EXISTS,
     GUF_ERR_ASSERT_FAIL,
+    GUF_ERR_IO,
     GUF_ERR_TYPES_NUM
 } guf_err;
 
diff --git a/src/guf_common.h b/src/guf_common.h
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diff --git a/src/guf_cstr.h b/src/guf_cstr.h
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diff --git a/src/guf_dbuf.h b/src/guf_dbuf.h
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diff --git a/src/guf_hash.h b/src/guf_hash.h
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diff --git a/src/guf_id_pool.h b/src/guf_id_pool.h
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diff --git a/src/guf_init.h b/src/guf_init.h
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diff --git a/src/guf_linalg.h b/src/guf_linalg.h
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diff --git a/src/guf_math.h b/src/guf_math.h
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diff --git a/src/guf_math_ckdint.h b/src/guf_math_ckdint.h
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diff --git a/src/guf_rand.h b/src/guf_rand.h
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diff --git a/src/guf_sort.h b/src/guf_sort.h
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diff --git a/src/guf_str.h b/src/guf_str.h
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new mode 100755
index 50e699e..7de9ee0
--- a/src/guf_str.h
+++ b/src/guf_str.h
@@ -128,6 +128,10 @@ GUF_STR_KWRDS guf_str_tok_state guf_str_tok_state_new(guf_str_view str, guf_str_
 */
 GUF_STR_KWRDS bool guf_str_tok_next(guf_str_tok_state *state, bool preserve_delims);
 
+GUF_STR_KWRDS unsigned guf_str_view_read_uint(guf_str_view *sv); // TODO: Handle overflow, signs etc.
+GUF_STR_KWRDS uint_least64_t guf_str_view_read_u64(guf_str_view *sv);
+
+
 
 // 2.) guf_str:
 
@@ -208,6 +212,14 @@ GUF_STR_KWRDS guf_str *guf_str_append_one_char(guf_str *str, char c);
 GUF_STR_KWRDS guf_str *guf_str_try_append(guf_str *str, guf_str_view sv, guf_err *err);
 GUF_STR_KWRDS guf_str *guf_str_append(guf_str *str, guf_str_view sv);
 
+// Append from file: 
+#define GUF_READ_FILE_BUFSIZE 128
+GUF_STR_KWRDS ptrdiff_t guf_str_try_append_file(guf_str *to_append,  const char *fname, guf_err *err);
+GUF_STR_KWRDS ptrdiff_t guf_str_append_file(guf_str *to_append,  const char *fname);
+
+// Append ints:
+GUF_STR_KWRDS guf_str *guf_str_append_u64(guf_str *str, uint_least64_t n);
+
 // Return a pointer to the null-terminated char array representing the string (works like std::string::c_str in C++)
 GUF_STR_KWRDS const char *guf_str_const_cstr(const guf_str *str);
 GUF_STR_KWRDS char *guf_str_try_get_cstr(guf_str *str, guf_err *err); // Error if str is readonly.
@@ -1142,6 +1154,66 @@ GUF_STR_KWRDS guf_str *guf_str_append(guf_str *str, guf_str_view sv)
     return guf_str_try_append(str, sv, NULL);
 }
 
+GUF_STR_KWRDS ptrdiff_t guf_str_try_append_file(guf_str *to_append,  const char *fname, guf_err *err)
+{
+    if (!fname) {
+        guf_err_set_or_panic(err, GUF_ERR_NULL_PTR, GUF_ERR_MSG("guf_str_read_file: fname is NULL"));
+        return 0;
+    }
+
+    FILE *f = fopen(fname, "r");
+    if (!f) {
+        guf_err_set_or_panic(err, GUF_ERR_IO, GUF_ERR_MSG("guf_str_read_file:: Failed to open file (fopen returned NULL)"));
+        return 0;
+    }
+
+    size_t chars_read = 0, total_chars_read = 0;
+    char buf[GUF_READ_FILE_BUFSIZE] = {'\0'};
+    while ((chars_read = fread(buf, sizeof buf[0], GUF_ARR_SIZE(buf), f)) && !ferror(f)) {
+        guf_str_append(to_append, (guf_str_view){.len = chars_read, .str = buf});
+        total_chars_read += chars_read;
+        if (feof(f)) {
+            break;
+        }
+    } 
+
+    if (ferror(f)) {
+        fclose(f);
+        guf_err_set_or_panic(err, GUF_ERR_IO, GUF_ERR_MSG("read_file: Unexpected error while reading file"));
+    } else {
+        GUF_ASSERT(feof(f));
+        fclose(f);
+    }
+
+    return total_chars_read;
+}
+
+GUF_STR_KWRDS ptrdiff_t guf_str_append_file(guf_str *to_append,  const char *fname) {
+    return guf_str_try_append_file(to_append, fname, NULL);
+}
+
+
+GUF_STR_KWRDS guf_str *guf_str_append_u64(guf_str *str, uint_least64_t n) {
+    
+    char buf[20] = {'\0'};
+    int start_idx = GUF_ARR_SIZE(buf);
+    int num_digits = 0;
+    do {
+        GUF_ASSERT(start_idx > 0);
+        char c = (n % 10) + '0';
+        buf[--start_idx] = c;
+        ++num_digits;  
+    } while ((n = n / 10));
+
+    GUF_ASSERT(num_digits == (int)GUF_ARR_SIZE(buf) - start_idx);
+
+    const guf_str_view num_sv = (guf_str_view) {.str = buf + start_idx, .len = num_digits};
+
+    return guf_str_append(str, num_sv);
+}
+
+
+
 GUF_STR_KWRDS guf_str *guf_str_try_substr(guf_str *str, ptrdiff_t pos, ptrdiff_t count, guf_err *err)
 {
     GUF_ASSERT(guf_str_is_valid(str));
@@ -1526,6 +1598,30 @@ GUF_STR_KWRDS bool guf_str_view_equal_val_arg(guf_str_view a_val, guf_str_view b
     return guf_str_view_equal(&a_val, &b_val);
 }
 
+GUF_STR_KWRDS unsigned guf_str_view_read_uint(guf_str_view *sv) 
+{ // TODO: Handle overflow etc. 
+    unsigned res = 0; 
+    while (sv->len && sv->str[0] >= '0' && sv->str[0] <= '9') {
+        res *= 10; 
+        res += (sv->str[0] - '0');
+        sv->len -= 1; 
+        sv->str = sv->len > 0 ? sv->str + 1 : NULL;
+    }
+    return res;
+}
+
+GUF_STR_KWRDS uint_least64_t guf_str_view_read_u64(guf_str_view *sv) 
+{ // TODO: Handle overflow etc. 
+    uint_least64_t res = 0; 
+    while (sv->len && sv->str[0] >= '0' && sv->str[0] <= '9') {
+        res *= 10; 
+        res += (sv->str[0] - '0');
+        sv->len -= 1; 
+        sv->str = sv->len > 0 ? sv->str + 1 : NULL;
+    }
+    return res;
+}
+
 #undef GUF_STR_IMPL
 #undef GUF_STR_IMPL_STATIC
 #endif /* end impl */
diff --git a/src/guf_str_view_type.h b/src/guf_str_view_type.h
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diff --git a/src/guf_utf8.h b/src/guf_utf8.h
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diff --git a/src/guf_utils.h b/src/guf_utils.h
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diff --git a/src/test/data/bartleby.txt b/src/test/data/bartleby.txt
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diff --git a/src/test/data/utf8-test.txt b/src/test/data/utf8-test.txt
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diff --git a/src/test/example.c b/src/test/example.c
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diff --git a/src/test/impls/alloc_libc_impl.c b/src/test/impls/alloc_libc_impl.c
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diff --git a/src/test/impls/alloc_tracker_impl.c b/src/test/impls/alloc_tracker_impl.c
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diff --git a/src/test/impls/ckdint_impl.c b/src/test/impls/ckdint_impl.c
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diff --git a/src/test/impls/dbuf_impl.c b/src/test/impls/dbuf_impl.c
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diff --git a/src/test/impls/dbuf_impl.h b/src/test/impls/dbuf_impl.h
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diff --git a/src/test/impls/dict_impl.c b/src/test/impls/dict_impl.c
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diff --git a/src/test/impls/dict_impl.h b/src/test/impls/dict_impl.h
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diff --git a/src/test/impls/init_impl.c b/src/test/impls/init_impl.c
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diff --git a/src/test/impls/linalg_impl.c b/src/test/impls/linalg_impl.c
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diff --git a/src/test/impls/str_impl.c b/src/test/impls/str_impl.c
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diff --git a/src/test/test.cpp b/src/test/test.cpp
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diff --git a/src/test/test.hpp b/src/test/test.hpp
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diff --git a/src/test/test_ckdint.cpp b/src/test/test_ckdint.cpp
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diff --git a/src/test/test_ckdint.hpp b/src/test/test_ckdint.hpp
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diff --git a/src/test/test_dbuf.cpp b/src/test/test_dbuf.cpp
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diff --git a/src/test/test_dbuf.hpp b/src/test/test_dbuf.hpp
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diff --git a/src/test/test_dict.cpp b/src/test/test_dict.cpp
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diff --git a/src/test/test_dict.hpp b/src/test/test_dict.hpp
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diff --git a/src/test/test_str.cpp b/src/test/test_str.cpp
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diff --git a/src/test/test_str.hpp b/src/test/test_str.hpp
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diff --git a/src/test/test_utf8.cpp b/src/test/test_utf8.cpp
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diff --git a/src/test/test_utf8.hpp b/src/test/test_utf8.hpp
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diff --git a/todo.txt b/todo.txt
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index 8070cb8..3fb13a1
--- a/todo.txt
+++ b/todo.txt
@@ -1,5 +1,7 @@
 - fix readonly str/uninit ?
 
+- dict: allow set
+
 - guf_stack, guf_queue, guf_dqueue, guf_prio_queue (using a heap), guf_ringbuf
 - sort: add cpp #ifdef to remove restrict from declaration
 
diff --git a/tools/ckdint-gen.py b/tools/ckdint-gen.py
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diff --git a/tools/intwrap-gen.py b/tools/intwrap-gen.py
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diff --git a/tools/min_max_clamp-gen.py b/tools/min_max_clamp-gen.py
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