That's why the current versions are still `0.x.x`, this reflects that each version could potentially have breaking changes. This follows the <a href="https://semver.org/" class="external-link" target="_blank">Semantic Versioning</a> conventions.

You can create production applications with **FastAPI** right now (and you have probably been doing it for some time), you just have to make sure that you use a version that works correctly with the rest of your code.

					continue
				}

				versionID := version.VersionID
				if versionID == "" {
					versionID = nullVersionID
				}

				var failure, ignore bool
				if version.Deleted {
					_, err := z.DeleteObject(ctx,
						bucket,
						version.Name,
						ObjectOptions{
							Versioned:         true,
							VersionID:         versionID,
							MTime:             version.ModTime,

		if versionID == "" {
			versionID = mustGetUUID()
			fi.IsLatest = true // we are creating a new version so this is latest.
		}
	}

	modTime = UTCNow() // We only preserve modTime if dstOpts.MTime is true.
	// in all other cases mtime is latest.

	fi.VersionID = versionID // set any new versionID we might have created
	fi.ModTime = modTime     // set modTime for the new versionID

		if err != nil {
			return opts, InvalidVersionID{
				Bucket:    bucket,
				Object:    object,
				VersionID: vid,
			}
		}
		if !versioned {
			return opts, InvalidArgument{
				Bucket: bucket,
				Object: object,
				Err:    fmt.Errorf("VersionID specified %s, but versioning not enabled on bucket=%s", opts.VersionID, bucket),
			}
		}
	}
	opts, err = putOptsFromHeaders(ctx, hdrs, metadata)
	if err != nil {

         * @return the current lease state
         */
        public int getLeaseState() {
            return leaseState;
        }

        /**
         * Gets the current lease epoch value for versioning
         * @return the current epoch
         */
        public int getEpoch() {
            return epoch;
        }

        /**
         * Gets the file path associated with this lease

	PrefixEnabledFn func(prefix string) bool // function which returns true if versioning is enabled on prefix

	// IndexCB will return any index created but the compression.
	// Object must have been read at this point.
	IndexCB func() []byte

	// InclFreeVersions indicates that free versions need to be included
	// when looking up a version by fi.VersionID
	InclFreeVersions bool

		dmVersionID := ""
		versionID := ""
		if objInfo.DeleteMarker {
			dmVersionID = objInfo.VersionID
		} else {
			versionID = objInfo.VersionID
		}
		dobj := DeletedObjectReplicationInfo{
			DeletedObject: DeletedObject{
				ObjectName:            object,
				VersionID:             versionID,
				DeleteMarkerVersionID: dmVersionID,

		}
		if globalBucketVersioningSys.PrefixEnabled(srcBucket, srcObject) && gr != nil {
			// Versioning enabled quite possibly object is deleted might be delete-marker
			// if present set the headers, no idea why AWS S3 sets these headers.
			if gr.ObjInfo.VersionID != "" && gr.ObjInfo.DeleteMarker {
				w.Header()[xhttp.AmzVersionID] = []string{gr.ObjInfo.VersionID}
				w.Header()[xhttp.AmzDeleteMarker] = []string{strconv.FormatBool(gr.ObjInfo.DeleteMarker)}

Aber sie erleichtert die Arbeit mit asynchronem Code erheblich.

Die gleiche Syntax (oder fast identisch) wurde kürzlich auch in moderne Versionen von JavaScript (im Browser und in NodeJS) aufgenommen.

Davor war der Umgang mit asynchronem Code jedoch deutlich komplexer und schwieriger.

	}

	// Initialize parts metadata
	partsMetadata := make([]FileInfo, len(onlineDisks))

	fi := newFileInfo(pathJoin(bucket, object), dataDrives, parityDrives)
	fi.VersionID = opts.VersionID
	if opts.Versioned && fi.VersionID == "" {
		fi.VersionID = mustGetUUID()
	}
	fi.DataDir = mustGetUUID()

	if ckSum := userDefined[ReplicationSsecChecksumHeader]; ckSum != "" {
		v, err := base64.StdEncoding.DecodeString(ckSum)