objectLockEnabled := false
	if vs := r.Header.Get(xhttp.AmzObjectLockEnabled); len(vs) > 0 {
		v := strings.ToLower(vs)
		switch v {
		case "true", "false":
			objectLockEnabled = v == "true"
		default:
			writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrInvalidRequest), r.URL)
			return
		}
	}

	forceCreate := false
	if vs := r.Header.Get(xhttp.MinIOForceCreate); len(vs) > 0 {

        checkArgument(
            fromUpperBounds.length == toUpperBounds.length
                && fromLowerBounds.length == toLowerBounds.length,
            "Incompatible type: %s vs. %s",
            fromWildcardType,
            to);
        for (int i = 0; i < fromUpperBounds.length; i++) {
          populateTypeMappings(mappings, fromUpperBounds[i], toUpperBounds[i]);
        }

	MOVB	$-128, -524288(R5)    // eb8050008052
	MOVB	$1, -524289(R6)       // c0a1fff7ffff41aa60009201a000

	// RX (12-bit displacement) and RXY (20-bit displacement) instruction encoding (e.g: ST vs STY)
	MOVW	R1, 4095(R2)(R3)       // 50132fff
	MOVW	R1, 4096(R2)(R3)       // e31320000150
	MOVWZ	R1, 4095(R2)(R3)       // 50132fff
	MOVWZ	R1, 4096(R2)(R3)       // e31320000150
	MOVH	R1, 4095(R2)(R3)       // 40132fff

	// Name of the file.
	Name string `msg:"n,omitempty"`

	// Represents the latest mod time of the
	// latest version.
	LatestModTime time.Time `msg:"lm"`

	Versions     []FileInfo `msg:"vs"`
	FreeVersions []FileInfo `msg:"fvs"`
}

// findVersionIndex will return the version index where the version
// was found. Returns -1 if not found.
func (f *FileInfoVersions) findVersionIndex(v string) int {

URLs that share the same address may also share the same underlying TCP socket connection. Sharing a connection has substantial performance benefits: lower latency, higher throughput (due to [TCP slow start](https://www.igvita.com/2011/10/20/faster-web-vs-tcp-slow-start/)) and conserved battery. OkHttp uses a [ConnectionPool](https://square.github.io/okhttp/4.x/okhttp/okhttp3/-connection-pool/) that automatically reuses HTTP/1.x connections and multiplexes HTTP/2 connections.

而且，最好的方式是使用现有的标准。

因此，甚至在开发 **FastAPI** 前，我就花了几个月的时间研究 OpenAPI、JSON Schema、OAuth2 等规范。深入理解它们之间的关系、重叠及区别之处。

## 设计

然后，我又花了一些时间从用户角度（使用 FastAPI 的开发者）设计了开发者 **API**。

同时，我还在最流行的 Python 代码编辑器中测试了很多思路，包括 PyCharm、VS Code、基于 Jedi 的编辑器。

根据最新 <a href="https://www.jetbrains.com/research/python-developers-survey-2018/#development-tools" class="external-link" target="_blank">Python 开发者调研报告</a>显示，这几种编辑器覆盖了约 80% 的用户。

	"EQ":  arm.C_SCOND_EQ,
	"NE":  arm.C_SCOND_NE,
	"CS":  arm.C_SCOND_HS,
	"HS":  arm.C_SCOND_HS,
	"CC":  arm.C_SCOND_LO,
	"LO":  arm.C_SCOND_LO,
	"MI":  arm.C_SCOND_MI,
	"PL":  arm.C_SCOND_PL,
	"VS":  arm.C_SCOND_VS,
	"VC":  arm.C_SCOND_VC,
	"HI":  arm.C_SCOND_HI,
	"LS":  arm.C_SCOND_LS,
	"GE":  arm.C_SCOND_GE,
	"LT":  arm.C_SCOND_LT,
	"GT":  arm.C_SCOND_GT,
	"LE":  arm.C_SCOND_LE,
	"AL":  arm.C_SCOND_NONE,

			if s, err := schema.Parse(arg, stmt.DB.cacheStore, stmt.DB.NamingStrategy); err == nil {
				selectedColumns := map[string]bool{}
				if idx == 0 {
					for _, v := range args[1:] {
						if vs, ok := v.(string); ok {
							selectedColumns[vs] = true
						}
					}
				}
				restricted := len(selectedColumns) != 0

				switch reflectValue.Kind() {
				case reflect.Struct:
					for _, field := range s.Fields {

     *       A=$( cd /b/c && sudo mkdir -p ${X[0]} && cd ${X[0]} && pwd |
     *           sed -e 's#^//*#/#' )
     *       B=$( cd /b/c && cd ${X[1]} && pwd )
     *       cmp -s <(echo $A) <(echo $B) || echo "$X[0] -> $A vs. $B"
     *     done | tee testoutput
     * - Move that testcases file to the appropriate name under testdata.
     *
     * The last test will take hours, and if it passes, the output will be empty.
     */

     *       A=$( cd /b/c && sudo mkdir -p ${X[0]} && cd ${X[0]} && pwd |
     *           sed -e 's#^//*#/#' )
     *       B=$( cd /b/c && cd ${X[1]} && pwd )
     *       cmp -s <(echo $A) <(echo $B) || echo "$X[0] -> $A vs. $B"
     *     done | tee testoutput
     * - Move that testcases file to the appropriate name under testdata.
     *
     * The last test will take hours, and if it passes, the output will be empty.
     */