PEP 410: Update for Nick's remarks

pep-0410.txt

@@ -42,8 +42,12 @@ bigger than 2^24 seconds (194 days: 1970-07-14 for an Epoch timestamp).
 Specification
 =============
 
-Add decimal.Decimal as a new type for timestamps. Add a *timestamp* optional
-argument to:
+Add decimal.Decimal as a new type for timestamps. Decimal supports any
+timestamp resolution, support arithmetic operations and is comparable.
+Functions getting float inputs support directly Decimal, Decimal is converted
+implicitly to float, even if the conversion may lose precision.
+
+Add a *timestamp* optional argument to:
 
  * os module: fstat(), fstatat(), lstat() and stat()
  * time module: clock(), clock_gettime(), clock_getres(), time() and
@@ -66,6 +70,10 @@ precision) in functions having timestamp arguments:
 
 The os.stat_float_times() is deprecated: use timestamp=int argument instead.
 
+.. note::
+   The decimal module is implemented in Python and is slow, but there is a C
+   reimplementation which is almost ready for inclusion in CPython.
+
 
 Backwards Compatibility
 =======================
@@ -124,6 +132,8 @@ datetime.datetime has issues:
   duplicate hour of switching from DST to normal time
 - time zone support is flaky-to-nonexistent in the datetime module
 
+datetime.datetime is also more complex than a simple number.
+
 datetime.timedelta
 ------------------
 
@@ -135,18 +145,7 @@ is more complex than a simple number and is not accepted by functions getting
 timestamp inputs.
 
 
-decimal.Decimal
----------------
-
-Decimal has an arbitrary precision, support arithmetic operations, is
-comparable. Functions getting float inputs support directly Decimal, Decimal is
-converted implicitly to float, even if the conversion may lose precision.
-
-Using Decimal by default would cause bootstrap issue because the module is
-implemented in Python, but using Decimal by default was not considered.
-
-The decimal module is implemented in Python and is slow, but there is a C
-reimplementation which is almost ready for inclusion in CPython.
+.. _tuple-integers:
 
 Tuple of integers
 -----------------
@@ -215,6 +214,14 @@ the callback has to be decided once and cannot be changed later. For example,
 adding a timezone or the absolution start of the timestamp (e.g. Epoch or
 unspecified start for monotonic clocks) would break the API.
 
+The protocol proposition was as being excessive given the requirements, but
+that the specific syntax proposed (time.time(timestamp=type)) allows this to be
+introduced later if compelling use cases are discovered.
+
+.. note::
+   Other formats can also be used instead of a fraction: see the `Tuple of integers
+   <tuple-integers>`_ section
+
 Add new fields to os.stat
 -------------------------
 
@@ -233,6 +240,10 @@ Add a boolean argument
 Because we only need one new type, decimal.Decimal, a simple boolean flag
 can be added. For example, time.time(decimal=True) or time.time(hires=True).
 
+The boolean argument API was rejected because it is not "pythonic". Changing
+the return type with a parameter value is preferred over a boolean parameter (a
+flag).
+
 Add new functions
 -----------------