Fix pendingBaseQueue memory

[yann-y]

Description

The pendingBaseQueue array is converted to a list.
When transferring large files, the array will not be gc, which takes up a lot of memory space.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.51 🎉

Comparison is base (44ed465) 80.43% compared to head (bfc0280) 80.94%.

❗ Current head bfc0280 differs from pull request most recent head cedecbc. Consider uploading reports for the commit cedecbc to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #264      +/-   ##
==========================================
+ Coverage   80.43%   80.94%   +0.51%     
==========================================
  Files          48       48              
  Lines        4043     4036       -7     
==========================================
+ Hits         3252     3267      +15     
+ Misses        648      628      -20     
+ Partials      143      141       -2     

Flag	Coverage Δ
go	80.94% <100.00%> (+0.51%)	⬆️
wasm	67.49% <100.00%> (+0.43%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pending_queue.go	82.95% <100.00%> (+0.81%)	⬆️

... and 5 files with indirect coverage changes

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[edaniels]

hey @yann-y just a heads up we are working on a v2 now that may obviate this issue, but wanted to keep you posted either way

[ukernel]

PendingQueue also leaks popped data, following change fixes it.

diff --git a/pending_queue.go b/pending_queue.go
index 6f70fea..44a956b 100644
--- a/pending_queue.go
+++ b/pending_queue.go
@@ -26,6 +26,7 @@ func (q *pendingBaseQueue) pop() *chunkPayloadData {
                return nil
        }
        c := q.queue[0]
+       q.queue[0] = nil
        q.queue = q.queue[1:]
        return c
 }