I don't think this is an important thing to fix, but I agree it is a bit 
odd. If there's a simple way to restore monotonicity we'll consider it.
A similar issue: https://github.com/golang/go/issues/41239

On Sunday, September 5, 2021 at 8:59:01 AM UTC-7 jake...@gmail.com wrote:

> You are 100% correct. I missed that value. oops
>
> On Sunday, September 5, 2021 at 10:16:08 AM UTC-4 arn...@gmail.com wrote:
>
>>
>>
>> On Sun, 5 Sep 2021, 14:59 jake...@gmail.com, <jake...@gmail.com> wrote:
>> [...]
>>
>>> In the example given  (https://play.golang.org/p/RJbEkmFsPKM 
>>> <https://play.golang.org/p/RJbEkmFsPKM>), the capacities *are 
>>> *"monotonically 
>>> increasing", as no number in the second column is smaller than the one 
>>> before it.
>>>
>>  
>> Nitpick: that is not true.  I copy-pasted the output of the playground 
>> below.
>>
>> 0 8
>> 100 208
>> 200 416
>> 300 640
>> 400 896
>> 500 1024
>> 600 1280
>> 700 1408
>> 800 1792
>> 900 2048
>> 1000 2048
>> 1100 1408 <-- at this point the new cap is less than for the previous row
>> 1200 1536
>> 1300 1792
>> 1400 1792
>> 1500 2048
>> 1600 2048
>> 1700 2304
>> 1800 2304
>> 1900 2688
>>
>> Regards,
>>
>> Arnaud
>>
>> On Sunday, September 5, 2021 at 7:02:43 AM UTC-4 kortschak wrote:
>>>
>>>> On Sun, 2021-09-05 at 03:51 -0700, Brian Candler wrote: 
>>>> > I'm not sure you're clear about what "monotonically increasing" 
>>>> > means. 
>>>> > 
>>>> > Are you saying that there are some cases where append() results in 
>>>> > the allocated size of a slice *shrinking*? If so, please 
>>>> > demonstrate. 
>>>>
>>>> I think he means that the cap of the appended slice is not a 
>>>> monotonically increasing function of the cap of the input slice. 
>>>>
>>>> https://play.golang.org/p/RJbEkmFsPKM 
>>>>
>>>>
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